Im not 100% sure for version but it makes sense the new update caused this.
I was around in my world and went under y=0 to enter my preveously build tube system. However, i realised it was completely broken! A huge part of the chunks beneath y=0 are gone missing. Not all, but a huge part. All above y=0 are there.
This freaking bug destroyed several hours of playing and building!!!!
Thank you for your report!
We're tracking this issue in MCPE-156679, so this ticket is being resolved and linked as a duplicate.
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