There is a bug where at the very bottom right of the map there is one dot that wouldn't fill in no matter what. Even if you get as close as possible to the dot it still wouldn't fill in. It is also making getting the "Map Room" achievement impossible to complete because of that one dot.
Related issues
duplicates
Attachments
Comments
migrated
[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-56979, 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.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki