If you keep holding the right mouse button while reloading a crossbow, the crossbow will stay like this forever until you release the button.
Linked issues
duplicates 1
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Comments 7

Can confirm in 20w48a. I've attached a video to help people better understand the issue.
Can confirm in 21w03a.
Can confirm in 21w06a.
Can confirm in 1.16.5 and 21w08b.
Can confirm in 21w11a.

Can confirm in 1.17.1. Might be a duplicate of MC-165461.
affects 20w29a