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Describe the bug
everything works perfectly fine, except any entity is just incapable of being hit most of the time. at seemingly random moments they can get hit by something but never more than once. they can still take fall damage, i can put lava on them to do damage, literally anything but hit them. interaction like lassos work fine, it's just the hitting.

To Reproduce
Steps to reproduce the behavior:
version 1.33.1, server running without breaks for just about a week, suddenly began after someone threw like 4 stacks of eggs and spawned a bunch of baby chickens, but i think it was happening on a lighter scale before that, but it definitely got worse after that.

Expected behavior
hit things with sword and do damage with said sword

Details
Please fill out the blanks below:
Modpack Version: (1.33.1)
Did you add or remove mods? (no)
Did you edit any config or script? (no)
Using shaders? [Write 'Default' if you are using default shader, if you are not using the default shader please write the name of the shader you are using.] (off)
Singleplayer, LAN game or server pack? (server pack)

Additional context
the server started on casual then was set to expert directly after, not sure that matters but just in case.