Hi, the story is that I was in the nether and I was blowing up the ceiling to make some space for some projects then I saw acient debris in a very high location, I dont know if it supposed to be here but I know that acient debris only generate in 8-18 here a picture showing the case.
Thank you for your report!
We're actually already tracking this issue at MCPE-69053, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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