I selected 1.16 but it may works in older versions too.
When you destroy a block and in the same tick place a block, the block will be placed on the same position as the destroyed block even if the placed block is surrounded by BlockAir.
I had to convert my footage to gif so i can fit in 10mb limit.
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-187569, which is a report that has not been resolved yet.
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