Steps to reproduce the problem=
When you join the game, the player is displayed weirdly
Expected result=
The player is normal with arms, legs, etc.
Actual result=
The player is twisted, invisible, or the armor is invisible; from the first-person view, the spear is inside the player or it doesn't work at all
_Eugh_ That’s just creepy. 😅
I have the same (only slightly less creepy) issue here:
MCPE-233689