If you insti mine blocks some times the turn into invisible ghost blocks...
You can walk into them but you will start suffocating, and if you place a block in it then it will re appear.
Edit: if you relog they reappear
Linked issues
duplicates 1
Comments 3
Thank you for your report!
We're actually already tracking this issue under MCPE-48914 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Here is a a video of the bug: https://drive.google.com/file/d/12uvJ1B5EYP4LfHWVzmRpss3g7Ct1Ziyb/view?usp=drivesdk