I have tried many times to finish the 'map room' achievemen,but it cannot be done.I think what I do is right, it may a bug. Attention: this bug has appeared some years ago and it is fixed.But,recently it has appeared again.
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A lot of people seem to be having issues with achievements.
[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-17233, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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