Idk this is bug or no, please help.

Entities detected and undetected quickly, I don't know what to call it. And it's annoying, sometime i can't attack the entities, like zombie, creeper, etc. Its happen in version 1.21, singleplayer and multiplayer, no other mods installed, only this mod and fabric-api. And this only affect in first person view.
I didn't config anything yet.

about the image, so the targeted entity just undetect and detect the entity, it happens in split milisecond, yes fast. I thought yea yea not a problem i think, but no, it is a problem, just like i said before before

i have the video for more explained in my drive
https://drive.google.com/file/d/1mO6JinoPzDMPzUaauoAFivlsz-lKJo8b/view?usp=drivesdk

mod version: 0.6.1
fabric 1.21