The bug
If you switch to a crossbow after charging another bow/crossbow, the crossbow you switched to will go weird for a second in the hotbar.
How to reproduce
Get a crossbow
Get a second bow. It can be either a regular bow or a crossbow
Start charging the second bow
Switch bows, while still holding right click
Watch the animation in the hotbar
Example
Here is an example in video:
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Please stop constantly changing your ticket, or I will be forced to change the ownership of the bug.