Forge version: 36.1.0 (1.16.5)
Twilight Forest version: 4.0.400 (1.16.5)
Link to crash log: Does not crash

Steps to reproduce:

1. Play TW with optifine
2. Find hydra or Naga
3. See the bug

What I expected to happen:
Seeing their full bodies

What happened instead:
Naga was missing her tail pieces while hydra was missing her heads

If this is due to optifine then there's nothing we can do

I'm currently having the same issue but on 1.12.2 not running optifine.

Twilightforest: 3.11.1021
Forge: 14.23.5.2854

The Naga is missing body parts, optifine is not installed.

Edit:

• Fixed it by disabling "entity culling mod".