The bug

When you pick up an item, it plays the "pop item animation" in the inventory, where the item becomes bigger and then smaller again. However banners and mob heads and player heads never play this animation.

How to reproduce:

1. Take a banner and any type of head
2. Take normal item, for example grass block
3. Drop all of the items on the ground
4. Pick up dropped items.
5. Look closely at the hotbar

Observed result:
The banner and the head didn’t play the "pop item animation" unlike the grass block.

Expected result:
Banner and heads should also have this animation.