This mod used to work with optifine but with the newest 1.15.2 beta of Optifine broke the visuals. The items still behave like they should, like floating, sinking, burning ect. But you don't see the items flip and sit flat on the ground. I know the Optifine is still in beta, but I figured I would let you know about it.

i suspect it is caused by McModLauncher/modlauncher#37 , and OptiForge may fix it temporarily.

I have reported this issue to Optifine, let's hope it can be solved: sp614x/optifine#3939

This issue should be fixed in the newest version of Optifine for 1.16.3.