Here I found a bug. In this bug a large amount of bedrock is exposed to air (which shouldn't happen according to java snapshots) and also glitches lava which will stay stable and dosen't flow.
MCPE-125212
Lava Bedrock Bug
Resolved
Duplicate
0
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We're tracking this issue in MCPE-125114, so this ticket is being resolved and linked as a duplicate.
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