Optimized chunk rendering performance, especially for chunks with many different block states.
Improved network handling of invalid biome IDs.
6 issues fixedFrom released versions before 1.15
MC-135050 – NullPointerException while tesselating block model.
MC-167482 – Corrupt chunk causes force upgrading a world to fail.
MC-167530 – Anvils ...
Release Date: 2019-12-17