Dropping an item by pressing the 'Drop item' keybind (Q by default) on the item from the creative inventory hotbar makes the item disappear. The hand animation still plays. This does not happen when in the survival inventory tab.
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I was unable to reproduce this in 21w08b. See the attached imaged.

When it says "single item stacks", it is referring to single items 🙂. If you read MC-175095, which was resolved as a duplicate of MC-170863, you will see it describes your issue.
It seems MC-23039 and MC-170863 were mis-linked if I am not mistaken, relates to instead of clones / cloned by.
Edit: Actually, no, because MC-23039 referred to stacks of any size, and MC-170863 is referring to single items only, which is the reason for the confusion.

Dupe of MC-170863
Can confirm. However, this seems to be a duplicate of MC-170863.