help with java animation....?

 I made entity that make sitting pose if the entity is on bed block.

but sitting pose do not work immediately.

Poses only applies when I reload the world back.

I can't sure what is wrong.
HELP

+ I already checked the entity's data, and it's sitting nbt tag change well

+07/12 12:45

I Think it's probelm of model.

But....I still can't figure out clearly