The Diamond generation is matching with the planned generation in 1.18. However We are only on 1.17. The Most reasonable answer is that some of the 1.18 code was added by accident causing generation to change. A video by IbxToycat can further explain this issue; You can Find it here https://youtu.be/POLZhswvFm8
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duplicates
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're tracking this issue in MCPE-127555, so this ticket is being resolved and linked as a duplicate.
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