Steps to Reproduce:
1. Generate a new world in 1.17.41.1 with the seed "-1957154863"
2. Teleport to the coordinates +7 +2 +4
3. Upgrade the world to 1.18.0
Observed Results:
Bedrock, that had not bedrock fully underneath all the way to Y=1 is still there.
Expected Results:
All Bedrock between Y=1 and Y=5 is replaced with deepslate.
This has been observed on Windows 10 and on Bedrock Dedicated Server and likely occurs on all platforms.
Thank you for your report!
We're tracking this issue in MCPE-149251, so this ticket is being resolved and linked as a duplicate.
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