There is a bug that marks a line with blue dots in my house and as I move those blue dots also and my roof is made of steps but that blue line is very strange.
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Thank you for your report!
We're tracking this issue as MCPE-33781, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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Might of had something similar in one of the old preview versions: MCPE-159475