The bug
While you pick up an item, it will not render behind transparent blocks such as water. This seems to affect all kinds of items.
To reproduce
Stand in one block high water
Throw an item
Pick it up
→ ❌ It will disappear while you pick it up
Video
[media]Linked issues
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Comments

Is this still an issue in 20w22a?
Fixed in 20w22a.
Affects 20w07a.