Gamepedia was upgraded to MediaWiki version 1.31 on Wednesday November 14th. To learn more about the upgrade and its effects click here.


From Minecraft Wiki
(Redirected from Jungle Slab)
Jump to: navigation, search
Oak Slab.pngSpruce Slab.pngBirch Slab.pngJungle Slab.pngAcacia Slab.pngDark Oak Slab.pngSmooth Stone Slab.pngSandstone Slab.pngCobblestone Slab.pngBrick Slab.pngStone Brick Slab.pngNether Brick Slab.pngQuartz Slab.pngRed Sandstone Slab.pngPurpur Slab.pngPrismarine Slab.gifPrismarine Brick Slab.pngDark Prismarine Slab.pngStone Slab.pngAndesite Slab.pngPolished Andesite Slab.pngDiorite Slab.pngPolished Diorite Slab.pngGranite Slab.pngPolished Granite Slab.pngMossy Stone Brick Slab.pngMossy Cobblestone Slab.pngSmooth Sandstone Slab.pngSmooth Red Sandstone Slab.pngQuartz Slab.pngRed Nether Brick Slab.pngEnd Stone Brick Slab.png
Oak Planks.pngSpruce Planks.pngBirch Planks.pngJungle Planks.pngAcacia Planks.pngDark Oak Planks.pngDouble Stone Slab.pngSandstone.pngCobblestone.pngBricks.pngStone Bricks.pngNether Bricks.pngBlock of Quartz.pngRed Sandstone.pngPurpur Block.pngPrismarine.pngPrismarine Bricks.pngDark Prismarine.pngStone.pngAndesite.pngPolished Andesite.pngDiorite.pngPolished Diorite.pngGranite.pngPolished Granite.pngMossy Stone Bricks.pngMossy Cobblestone.pngSmooth Sandstone.pngSmooth Red Sandstone.pngBlock of Quartz.pngRed Nether Bricks.pngEnd Stone Bricks.png


Double slab: No
Single slab: Partial (blocks light)



Blast resistance

Wood: 15
Stone: 30



Stone: Yes
Wood: Yes (except Petrified Oak)
Cobblestone: Yes
Stone Brick: Yes
Purpur: Yes
Quartz: Yes[Legacy Console Edition only]
Prismarine: Yes
All others: No


Yes (64), same type only


Wood: Yes
Stone: No


Single Slab: Itself
Double Slab: 2

Petrified Oak Slab:
[Bedrock Edition only]

Data values

See Data values


See Data values

Slabs are half-versions of their respective blocks.


Stone-type slabs and smooth blocks require a pickaxe to mine. Wooden slabs can be mined with anything, but an axe is quickest.



Petrified Oak
Hardness 2 2 2

Breaking time[note 1]
Hand 10 3 3
Wooden 1.5 1.5 1.5
Stone 0.75 0.75 0.75
Iron 0.5 0.5 0.5
Diamond 0.4 0.4 0.4
Golden 0.25 0.25 0.25
  1. Times are for unenchanted tools in seconds.

Natural generation[edit]

Stone slabs can be found naturally in villages lining the roof of blacksmith shops and inside the Butcher's Shop and the Blacksmith where they form counters. They are also found in strongholds where they are used in some of the stairs, ledges and torch pillars. Sandstone slabs can be found naturally in desert villages, desert wells, and desert temples. Double stone slabs can be found in villages, in the butcher's shop and in blacksmiths. A spruce wood slab serves as a table in igloo basements. Oak, birch, spruce, stone and cobblestone slabs can also be found in woodland mansions.

Creative inventory[edit]

Smooth blocks can be found in Creative inventory.


Name Ingredients Crafting recipe Description
Wood Slab Matching Planks
Stone Slab Stone Can use stone only.[Java and Bedrock editions only][until 1.14]
Stone Slab Any Stone Can use stone, andesite, polished andesite, granite, polished granite, diorite and polished diorite interchangeably.[Legacy Console Edition only]
Smooth Stone Slab
Smooth Stone
Cobblestone Slab Cobblestone
Brick Slab Bricks
Stone Brick Slab Any Stone Bricks
Nether Brick Slab Nether Bricks
Sandstone Slab Any Sandstone
Red Sandstone Slab Any Red Sandstone
Quartz Slab Any Quartz Block
Purpur Slab Any Purpur Block
Prismarine Slab or
Prismarine Brick Slab or
Dark Prismarine Slab
Prismarine or
Prismarine Bricks or
Dark Prismarine
Stone Slab
Andesite Slab or
Polished Andesite Slab
Andesite or
Polished Andesite
Diorite Slab or
Polished Diorite Slab
Diorite or
Polished Diorite
Granite Slab or
Polished Granite Slab
Granite or
Polished Granite
Mossy Stone Brick Slab
Mossy Stone Bricks
Mossy Cobblestone Slab
Mossy Cobblestone
Smooth Sandstone Slab
Smooth Sandstone
Smooth Red Sandstone Slab
Smooth Red Sandstone
Smooth Quartz Slab
Smooth Quartz
Red Nether Brick Slab
Red Nether Bricks
End Stone Brick Slab
End Stone Bricks



Slabs can occupy either the top half or the bottom half:

  • Pointing at the top of a block or the bottom half one of its sides will place the slab in the lower half.
  • Pointing at the bottom of a block or the top half of its side will place the slab in the top half.

Slabs cannot be oriented sideways.

Crafting ingredient[edit]

Name Ingredients Crafting recipe
Armor Stand Stick +
Smooth Stone Slab

Chiseled Quartz Block Quartz Slab

Chiseled Sandstone or
Chiseled Red Sandstone
Sandstone Slab or
Red Sandstone Slab

Chiseled Stone Bricks Stone Brick Slab

Daylight Detector Glass +
Nether Quartz +
Any wood Slab

Purpur Pillar Purpur Slab


An example of how upside-down slabs can make redstone travel compactly "up stairs".
Slabs do not block a vertical redstone connection as it is a transparent block.

Slabs are treated as a whole block by other blocks and liquids. Two slabs can be piled on top of one another to make a full-size block, but different slab types cannot be mixed in this way.

Double slabs are handled as a single block instead of two different slabs; as such, breaking one will destroy the whole block and drop two slabs, as opposed to only breaking one slab within the block. "Double slabs" that are not aligned to the grid (i.e. a bottom slab on top of a top slab) are handled as separate blocks and are broken individually.

Redstone can be connected to the wire on the side of the slabs. Redstone placed on top of an upside-down slab can receive signals from an adjacent block of redstone one block lower, but cannot transmit signals to it. This is why "ladders" made from upside-down slabs, as pictured to the right, can transmit redstone signals up, but not down.

Mobs see a slab as a full block. Mobs can also spawn on the tops of upside-down slabs and double slabs, but not on lower slabs.

In Bedrock Edition, mobs standing on right-side up slabs fail to pathfind correctly. They seem to perceive the slabs beneath them to be unwalkable, and will often end up spinning around in a small circle when they try to move. The block directly beneath the slab must be air or another right-side up slab to disturb pathfinding. Also in Bedrock Edition iron golems will not spawn on a slab even if it is the top half of a block.

Due to the way blast rays propagate from an explosion, bottom-half slabs provide extremely effective absorption to explosions directly on top of them.

Sneaking only reduces the player's hitbox height to 1.65 blocks, and so does not allow the player to walk over a single slab with one block of air above it, which is 1.5 blocks of space. A player cannot walk from a block of soul sand directly up to a slab without jumping – this applies not just to soul sand, but to any block 78 of a block high or shorter, because the maximum step height of the player is 0.6 of a block. The player can walk off a slab while sneaking, because the sneaking only prevents falling when the distance is higher than one half block.

If a slab is placed underwater, the empty half of that slab's block will be waterlogged if the block it is in was a source block. If the slab is placed in flowing water upside down, not only can the player grab a quick breath of air there, but the player can see as clearly as if they were above the surface.

Minecarts on powered rails will not be repelled from a slab. They will, however, be repelled by a slab with a minecart on top.

Falling block entities (like sand, gravel, and concrete powder) will turn into their dropped form if they land on a slab, exactly like what occurs when they fall on a torch.

Slabs do not block light.[Bedrock Edition only]


Wooden slabs can be used as a fuel in furnaces, smelting 0.75 items per slab in the Java Edition and Legacy Console editions, and smelting 1.5 items per slab in Bedrock Edition.

Data values[edit]


Java Edition:

Block ID Name

Red Sandstone Slab

Purpur Slab

Stone Slab[until 1.14]
Smooth Stone Slab[upcoming 1.14]
stone_slab[until 1.14]
smooth_stone_slab[upcoming 1.14]

Sandstone Slab

Petrified Oak Slab

Cobblestone Slab

Brick Slab

Stone Brick Slab

Nether Brick Slab

Quartz Slab

Oak Slab

Spruce Slab

Birch Slab

Jungle Slab

Acacia Slab

Dark Oak Slab

Prismarine Slab

Prismarine Brick Slab

Dark Prismarine Slab

Stone Slab[upcoming 1.14]
stone_slab[upcoming 1.14]

Granite Slab[upcoming 1.14]
granite_slab[upcoming 1.14]

Polished Granite Slab[upcoming 1.14]
polished_granite_slab[upcoming 1.14]

Diorite Slab[upcoming 1.14]
diorite_slab[upcoming 1.14]

Polished Diorite Slab[upcoming 1.14]
polished_diorite_slab[upcoming 1.14]

Andesite Slab[upcoming 1.14]
andesite_slab[upcoming 1.14]

Polished Andesite Slab[upcoming 1.14]
polished_andesite_slab[upcoming 1.14]

Red Nether Brick Slab[upcoming 1.14]
red_nether_brick_slab[upcoming 1.14]

End Stone Brick Slab[upcoming 1.14]
end_stone_brick_slab[upcoming 1.14]

Mossy Stone Brick Slab[upcoming 1.14]
mossy_stone_brick_slab[upcoming 1.14]

Mossy Cobblestone Slab[upcoming 1.14]
mossy_cobblestone_slab[upcoming 1.14]

Smooth Sandstone Slab[upcoming 1.14]
smooth_sandstone_slab[upcoming 1.14]

Smooth Red Sandstone Slab[upcoming 1.14]
smooth_red_sandstone_slab[upcoming 1.14]

Smooth Quartz Slab[upcoming 1.14]
smooth_quartz_slab[upcoming 1.14]

Bedrock Edition:

Block ID Name Numerical ID

Double Stone-type Slabs
double_stone_slab 43

Stone-type Slabs
stone_slab 44

Double Wooden Slabs
double_wooden_slab 157

Wooden Slabs
wooden_slab 158

Other Double Stone Slabs
double_stone_slab2 181

Other Stone Slabs
stone_slab2 182

Block data[edit]

See also: Data values

In Bedrock Edition, slabs use the following data values:

Double stone slab
DV Description

0 Double Stone Slab

1 Double Sandstone Slab

2 Double (Stone) Wooden Slab

3 Double Cobblestone Slab

4 Double Bricks Slab

5 Double Stone Brick Slab

6 Double Quartz Slab

7 Double Nether Brick Slab
Double stone slab 2
DV Description

0 Double Red Sandstone Slab

1 Double Purpur Slab

2 Double Prismarine Slab

3 Double Prismarine Brick Slab

4 Double Dark Prismarine Slab
Stone slab
DV Description

0 Stone Slab

1 Sandstone Slab

2 (Stone) Wooden Slab

3 Cobblestone Slab

4 Bricks Slab

5 Stone Brick Slab

6 Nether Brick Slab

7 Quartz Slab

8 Upper Stone Slab

9 Upper Sandstone Slab

10 Upper (Stone) Wooden Slab

11 Upper Cobblestone Slab

12 Upper Bricks Slab

13 Upper Stone Brick Slab

14 Upper Nether Brick Slab

15 Upper Quartz Slab
Stone slab 2
DV Description

0 Red Sandstone Slab

1 Purpur Slab

2 Prismarine Slab

3 Prismarine Brick Slab

4 Dark Prismarine Slab

8 Upper Red Sandstone Slab

9 Upper Purpur Slab

10 Upper Prismarine Slab

11 Upper Prismarine Brick Slab

12 Upper Dark Prismarine Slab
Double wood slab
DV Description

0 Double Oak Slab

1 Double Spruce Slab

2 Double Birch Slab

3 Double Jungle Slab

4 Double Acacia Slab

5 Double Dark Oak Slab
Wood slab
DV Description

0 Oak Wood Slab

1 Spruce Wood Slab

2 Birch Wood Slab

3 Jungle Wood Slab

4 Acacia Wood Slab

5 Dark Oak Wood Slab

8 Upper Oak Wood Slab

9 Upper Spruce Wood Slab

10 Upper Birch Wood Slab

11 Upper Jungle Wood Slab

12 Upper Acacia Wood Slab

13 Upper Dark Oak Wood Slab

Block states[edit]

See also: Block states
Name Value Description

Where the slab is within its block.
doubleThe block is a double slab.

Whether or not there's water in the same place as this slab.


Note: This video is outdated, as red sandstone slabs were added in 1.8, purpur slabs were added in 1.9, and prismarine slabs were added in 1.13.


This page would benefit from the addition of more images.
Please remove this notice once you've added suitable images to the article. The specific instructions are: Upload what corresponds to the missing image links.
Java Edition Classic
May 17, 2009Slabs were suggested on the TIGSource forums.
0.26 (October 22, 2009, 1) Dirt Slab.png Dirt slab test.
0.26 (October 23, 2009, 2) Half block has nearly been finished.
0.27 SURVIVAL TEST Stone Slab Revision 1.png Stone slabs have now been introduced to the game.
Stone slabs can be obtained by mining coal ore because of the lack of inventory and crafting.
Slabs were originally called stairs.
Java Edition Indev
0.31 0.31 (January 29, 2010) Slabs have now received a crafting recipe: 3 slabs from 3 cobblestone.
Slabs are now no longer dropped from coal ore.
Java Edition Infdev
June 29, 2010 Renamed stairs to slabs.
Java Edition Beta
1.3 Sandstone Slab Revision 1.png Oak Slab Revision 1.png Cobblestone Slab Revision 1.png Added sandstone, "wooden" and cobblestone slabs as variants of the stone slabs. All had the same properties as stone slabs, apart from using different textures.
The original wooden slabs will now the oak plank texture, the only plank type at the moment. Being variants of the stone slabs, they have to be mined with a pickaxe to collect, were not affected by fire, and had stronger blast resistance than wooden planks, making them a useful building material. The only way to obtain this slab on current versions is by using commands. The item tooltip will now say "Wooden Slab" rather than "Oak Wood Slab", and the item form is now a large full block with a missing texture.
Before the additional slabs were added, a double stone slab would only yield one slab when broken. Since this update, all double slabs will now yield 2 of their respective single slabs when broken. Destroying double slabs with TNT, however, still only yields single slabs (when the slabs aren't simply destroyed by the explosion).
Before Beta 1.3 came out, stone slabs were made with cobblestone instead of stone, but this update has now introduced cobblestone slabs to the game and changed the recipes for pressure plates and stone slabs, so that there wouldn't be any conflicting recipes.
1.7 Sandstone Slab Revision 2.png Oak Slab Revision 2.png Cobblestone Slab Revision 2.png Smooth Stone Slab.png Bottom slabs will now use the bottom half of the double slab texture rather than the top.
Cobblestone Slab.png The texture of the cobblestone slab has now been updated.
1.8 ?Stone Brick Slab.png Brick Slab Revision 1.png Smooth Stone.png Added the stone brick, bricks, and smooth stone double slab. (Smooth stone double slab are only obtainable through inventory editing.)
The sprinting feature has been added in this update. While stairs will the player's sprinting, slabs allow a player to continue sprinting.
Java Edition
1.0.0 Beta 1.9 Prerelease 5 Oak Slab.png Brick Slab.png The textures of bricks and planks have now been updated, and by extension that of the slabs.
1.2.1 1.2-pre All types of slabs are now able to be placed upside down and under blocks; these occupy the top half of their block space rather than the bottom half.
The crafting recipe has now been changed, so that 6 slabs would be crafted rather than 3. The prior restriction was likely due to the fact that the slab types were differentiated by their damage values instead of by different data values, similar to wood, coal or charcoal, and colored wool.
1.3.1 12w17a Oak Slab.png Birch Slab.png Spruce Slab.png Jungle Slab.png New slabs have now been added for the four different types of wood planks, replacing the old wooden oak/"stone" slab. These new slabs are vulnerable to fire, and can be collected faster with an axe than with a pickaxe. Wooden slabs already crafted or placed in the world will remain the old 'stone' type.
12w21a Sandstone slabs will now generate in desert temples.
12w25a Redstone (including repeaters, torches. levers and pressure plates) and rails can now be placed on slabs and stairs positioned upside down.
12w26a Mobs can now spawn on upside down slabs.
1.4.2 12w39a Slabs will now interact properly with lighting.
When slabs are placed upside down, they will now accept light from light sources themselves, and no longer block light to surrounding blocks.
Slabs will now no longer cast the shadow of a full-sized block.[1]
1.4.6 November 28, 2012Jeb tweeted a picture of himself crafting nether brick slabs.
12w49a Nether Brick Slab.png Added nether brick slabs, which has now caused the smooth stone double slab to change its data value to 43:7.
1.5 January 22, 2013Jeb states that the "smooth stone full half-slab" will be re-implemented with a data value of 43:8. Other slabs with data values of 43:9-43:15 will also use the top texture on all sides, resulting in a "smooth sandstone block" with a data value of 43:9. He also stated that they may be obtained legitimately later.[2]
13w01a Wooden Slabs can now be used to craft daylight sensors.
13w02a Quartz Slab.png Added quartz slabs, featuring the top quartz texture on all six sides. The formerly unused slab type, known as the smooth stone slab, has now been removed from the game. Its data values have been replaced with the nether quartz slab.
13w04a Smooth Sandstone.png The smooth stone double slab has now been re-implemented with a data value of 43:8.
The smooth sandstone double slab has now been added, with a data value of 43:9.
Seamless data values of 43:10-43:15 have now been added, but are unused and appear identical to their normal counterparts.
13w09c Quartz slabs and double slabs will now use the top, side and bottom textures of the block of quartz.
Block of Quartz.png The quartz slab's seamless counterpart, with a data value of 43:15, retains the top texture on all 6 sides.
?Sandstone Slab.png The texture of sandstone slabs have now been changed slightly.
1.7.2 1.7-pre Acacia Slab.png Dark Oak Slab.png Added acacia and dark oak slabs.
1.8 14w02a Stone brick slabs can now be used to craft chiseled stone bricks.
Stone slabs can now be crafted using granite, diorite, andesite, or their polished counterparts.
14w25a Double stone slabs and double wooden slabs can now no longer be obtained as an item.
14w32a Red Sandstone Slab.png Smooth Red Sandstone.png Added red sandstone slabs and double slabs, as well as smooth red sandstone double slabs.
Armor stands are now crafted using any slab.
14w32b Armor stands can now only be crafted using stone slabs.
14w33a Stone slabs can now no longer be crafted using granite, diorite, andesite, or their polished counterparts.
1.9 June 22, 2015Jeb reveals purpur slabs on Instagram, with the words "MINECON 2015 HYPE!"
15w31a Purpur Slab.png Added purpur slabs and double slabs.
15w43a A spruce slab will now act as the middle of a table generated within igloo basements.
1.11 16w39a Oak, birch, spruce, stone, and cobblestone slabs will now generate in woodland mansions.
1.13 17w47a The different variant block states for stone_slab, stone_slab2, wooden_slab, purpur_slab, double_stone_slab, double_stone_slab2, double_wooden_slab and purpur_double_slab IDs have now been split up and merged into their own IDs depending on variant.
Old non-flammable wooden slabs, which are now called "Petrified oak slabs", have been re-implemented into the creative inventory.
"Bricks slab" has now been renamed to "Brick slab".
"Stone bricks slab" has been renamed to "Stone brick slab".
<Wood type> wood slab has now been renamed to <wood type> slab.
Smooth Stone.png Smooth Sandstone.png Smooth Red Sandstone.png Block of Quartz.png Smooth double slabs, now smooth blocks, have added to the creative inventory. Smooth blocks will now drop themselves, instead of slabs when mined.
Prior to The Flattening, these blocks' numeral IDs were 43, 44, 125, 126, 181, 182, 204 and 205.
18w07a Prismarine Slab.png Prismarine Brick Slab.png Dark Prismarine Slab.png Added slabs for prismarine, prismarine bricks, and dark prismarine.
18w10c Water can now be placed on the same block as slabs.
April 17, 2018Dinnerbone confirms that 1.14 will contain many new stairs and slabs.
1.13 18w20a Changed the name of "Prismarine Bricks Slab" to "Prismarine Brick Slab."
1.13.1 18w32a Purpur slabs can now be crafted with purpur pillars.
October 10, 2018Dinnerbone tweets that there will be 14 new slabs.
October 10, 2018Polished diorite slabs are tweeted out by LadyAgnes.
Upcoming Java Edition
1.14 18w43a Added andesite, polished andesite, diorite, polished diorite, granite, polished granite, mossy stone brick slab, mossy cobblestone, smooth sandstone, smooth red sandstone, smooth quartz, red nether brick, end stone brick slabs.
Pocket Edition Alpha
0.1.0 Smooth Stone Slab.png Added stone slabs.
0.3.0 Oak Slab.png Brick Slab.png Cobblestone Slab.png Added wood (original oak), brick and cobblestone slabs.
0.6.0 Sandstone Slab.png Stone Brick Slab.png Added sandstone and stone brick slabs.
Slabs can now be placed on the top half of blocks.
The recipes for crafting slabs will now give 6 slabs, instead of 3 slabs.
0.7.3 Quartz Slab.png Added quartz slabs.
Wooden slabs can now be crafted during and after this update are now flammable. Existing wooden slabs (which have stone properties) are now tagged "Fake Wood Slab" and drop real wooden slabs.
0.8.0 build 2 Birch Slab.png Spruce Slab.png Jungle Slab.png Added birch, spruce and jungle wood slabs.
0.9.0 build 1 Acacia Slab.png Dark Oak Slab.png Added acacia and dark oak wood slabs.
Stone slabs will now generate naturally in villages.
build 11 Added crafting recipe for jungle wood slabs.
?Changed wooden slab name from [woodtype] Slab to [woodtype] Wood Slab.
0.12.1 build 1 Nether Brick Slab.png Added nether brick slabs.
0.13.0 build 1 Wooden slabs are now used to craft daylight sensors.
Sandstone slabs will now generate in desert temples.
0.14.0 build 1 Red Sandstone Slab.png Added red sandstone slabs.
0.14.2 Nether Brick Slab PE.png The nether brick slab texture has now been brightened.
Pocket Edition
1.0 alpha 0.17.0 Purpur Slab.png Added purpur slabs.
A spruce slab will now act as the middle of a table generated within igloo basements.
1.1 alpha Oak, birch, spruce, stone, and cobblestone slabs will now generate in woodland mansions.
Bedrock Edition
1.2 beta Stone slabs are now used to craft armor stands.
1.4 beta Prismarine Slab.png Prismarine Brick Slab.png Dark Prismarine Slab.png Added slabs for prismarine, prismarine brick and dark prismarine as part of Experimental Gameplay.
beta The slabs for prismarine, prismarine brick, and dark prismarine have now been fully implemented.
Legacy Console Edition
TU1CU11.0Patch 1Stone Slab.png Oak Slab.png Sandstone Slab.png Cobblestone Slab.png Added stone, wood (original oak), sandstone and cobblestone slabs.
TU5Stone Brick Slab.png Brick Slab.png Added stone brick and brick slabs.
TU9Birch Slab.png Spruce Slab.png Nether Brick Slab.png Added birch wood, spruce wood and nether brick slabs.
Wooden slabs crafted during and after this update are now flammable and are broken with an axe instead of a pickaxe. Existing slabs (which have stone properties) are not stackable with the new slabs.
TU12Jungle Slab.png Added jungle wood slabs.
Slabs can now be placed upside down.
Items can now be placed directly on upside down slabs.
TU141.04Quartz Slab.png Added quartz slabs.
The placement of half blocks and other blocks on half blocks has now been changed.
The placement of upside down slabs has now been changed.
TU27CU151.18Acacia Slab.png Dark Oak Slab.png Added acacia and dark oak wood slabs to the creative inventory.
TU46CU361.38Patch 15Purpur Slab.png Added purpur slabs.
TU691.76Patch 38Prismarine Slab.png Prismarine Brick Slab.png Dark Prismarine Slab.png Added slabs for prismarine, prismarine bricks and dark prismarine.
New Nintendo 3DS Edition
1.7.10 Purpur Slab.png Added purpur slabs.


Issues relating to "Slab" are maintained on the bug tracker. Report issues there.


  • Slabs let a small amount of light pass through their edges. This light is only visible when Smooth Lighting is turned on, and does not affect mob spawning or other light-dependent processes.
    • The exception of this is that any light directed through a slab does not affect any block's light values north of the source.
  • Whereas 1x1 dents in a flat floor using slabs are darkened as one would expect, 1x1 dents created using 2x1 or 2x2 stairs will darken less, due to having fewer surrounding solid blocks. This is a completely intentional feature.[3]
  • When water or lava are on top of an upside-down slab, the water dripping particles will appear in midair below the slab instead of from the slab itself, this was fixed in Java Edition 1.13-pre7[4], but is an intentional feature in Bedrock Edition.[5]