Lithium 0.15.3 for Minecraft 1.21 and 1.21.1 backports an optimization and a bug fix.
Make sure to take a backup of your world before using the mod and please report any bugs and mod compatibility issues at the issue tracker. You can check the description of each optimization and how to disable it when encountering a problem.
Additions
- Add missing palette crash recovery attempt
- Use cached false values for fluid hole search
Fixes
- Fix negative indices caused by byte to int cast (crash with modded fluids #719)