Place a block somewhere in the air
If you are in Creative mode(for insta break) break and place in the same time, and the block won't get destroyed, so you placed a block in the air(you will hear both the place and the break sounds)
Video for the bug: https://youtu.be/pcS2AK8bvtA
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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