If a chunk has some blocks in it but you break every block, then save and quit, once you rejoin, not only do you still have the blocks in your inventory but the blocks are still there and cannot be removed, this means that void worlds get worse over time.
This has existed for months now.
Thank you for your report!
We're tracking this issue in MCPE-159434, so this ticket is being resolved and linked as a duplicate.
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