Combat Test 8c is the ninth experimental version of a future combat revision which changes the mechanics of shields.[1] Although it is a development version for a future release, this combat experiment is a fork of 1.16.2. This version was released only on Reddit, so it does not appear in the launcher or in any Minecraft.net blog post.
Combat Test 8c has the same protocol version as Combat Test 8b, which means these versions are cross-compatible with each other.
This is also the first time 2 development versions have had the same protocol version excluding joke versions. The last one was on September 15, 2017, with 1.12.2-pre1 and 1.12.2-pre2.
Notes
↑Unzip this file in the .minecraft/versions folder.