Banners in the inventory/creative slots start animating if there are placed banners being rendered and the player isn't holding one.
Steps to Reproduce:
Place a banner somewhere you can see it.
Stop holding the banner.
Observed Results:
The banner in the hotbar starts "mimicking" the placed banner animation.
Expected Results:
The banner in the hotbar should not animate just like when you're holding it.
Screenshots/Videos:
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However, this issue has been closed as Won't Fix.
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