If you charge a crossbow you cannot actually see your hand charging it as the crossbow is lower than before.
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it's to make it look realistic
Not to be confused with the Bedrock Edition's crosbow charging animation because this animation was shown at Minecon Earth.
I think this is working as intended.

Resolve as WAI?

WAI

WAI. Closed
Can confirm in 21w06a.
Can confirm in 21w11a.

In Bedrock Edition, the crossbow is slightly higher and tilted (see attachment in MC-165461).
This is most likely working as intended.