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Minecraft 17w49b

Java Edition



Release date

December 7, 2017

Snapshot for



Client (.json)

Protocol version


Data version


17w49b[1] is the tenth snapshot released for Java Edition 1.13, which added function tags.


  • Added tags for functions.
    • Functions tagged in minecraft:tick will run every tick at the beginning of the tick.
  • Added block and item tags for buttons, carpets, doors, logs, saplings, and stone_bricks to the vanilla data pack.
  • Added a block tag for flower_pots to the vanilla data pack.
  • When overriding a tag, you now append instead of replacing.
  • Advancement item predicates now support item tags.


  • Removed the gameLoopFunction gamerule in favor of functions tagged in minecraft:tick.


20 issues fixed
From released versions before 1.13
  • MC-3794 – Chest direction placing glitch
  • MC-32539 – You can write on both the server name and the server address input field at the same time
  • MC-65983 – Mouse cursor moves off-window when accessing inventory (or item contents)
  • MC-109799 – Observer don't power when update and push by piston at the same time
From the 1.13 development versions
  • MC-122711 – Piston leave their head behind
  • MC-122725 – Unable to duplicate banners in crafting table
  • MC-122889 – The name of the chiseled sandstone recipe is cut_sandstone, not chiseled_sandstone
  • MC-122931 – Frost walker freezes all water, even if there are mobs in the water
From the previous development version
  • MC-122910 – New block/item tags don't work in commands
  • MC-122914 – The texture of the lava and water is invisible when there is a block above
  • MC-122916 – team color commands don't work properly
  • MC-122918 – Log crafting recipes produce one plank
  • MC-122924 – Wrong crafting recipe output for granite and andesite
  • MC-122925 – Opening spectator menu crashes the client
  • MC-122935 – hang on 'waiting for chunk' and/or fatal background exceptions when teleporting to new chunks in a busy gameloop
  • MC-122964 – Game crashes when pistons push concrete powder next to water
  • MC-123044 – The recipe for cobblestone stairs is named "stone_stairs.json" instead of "cobblestone_stairs.json".
Private issues
  • MC-21073 – Private issue
  • MC-59509 – Private issue
  • MC-100579 – Pistons do not account for block updates triggered by blocks broken by the extending piston when placing moved blocks, resulting in duplication issues[1]


Video made by slicedlime:


  1. a b "Minecraft Snapshot 17w49a" – Minecraft.net, December 6, 2017