Sometimes, while choosing a block from the creative menu using "1" to "9" buttons you stack of blocks can be like this (FILE 3.1)
How I accomplished it (I have done these actions in a very short amount of time):
Hovered my cursor over the block I wanted to get. (Example: Oak Planks)
Pressed the "1" to "9" button on the keyboard. (Example: "1")
Repeated with all 6 wood planks types.
"Enjoyed" the ghost block bug.
P. S. I wasn't able to recreate the bug another time.
P. S. S. Sorry for video lags.
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I've been able to reproduce it. Needed a few tries though.

I think that's another bug, not those ones.
Very difficult and unreliable to reproduce, but I can confirm it in 1.20.1
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