EDIT : Was due to the "item stitching fix" resource pack from Vanilla Tweaks, when removed it didn't happen. But this makes me wonder if this is a bug in the game that could after resource packs in some way ?
First noticed when a pillager dropped it upon death, but after dropping it myself, still had the same issue.
Happened after shooting and reloading, so it's not the durability nor a one-time bug.
Unloaded crossbow renders properly as well.
Linked issues
is duplicated by 6
1 more links
It's an issue the the pack not the game