Minecraft v1.16.5
Forge v36.1.4
Menu Companions v1.2.3

I have recently noticed that mobs and the players are being added to the blacklist, and I suspect this is because of the Hats and Googly Eyes mods, since all the mobs that get added to the blacklist can have googly eyes or hats. Mobs that don't have hats or googly eyes render as normal.
There is no error printed out in the logs.

Minecraft v1.16.5
Forge v36.2.34
Menu Companions v1.2.3
Hats v10.3.3

Can confirm that Menu Companions conflict with Hats mod