The bug
When an item is picked up, it shows a little squishing animation. The problem is that when that happens, the item renders behind the square that goes around a hotbar slot indicating that the item is selected.
Sounds confusing, but just watch the short video, it's super obvious.
Video
Note that if the slot isn't selected, the item properly draws on top of the regular hotbar
Linked issues
Attachments
Comments 2
Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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I can confirm for 1.16.100