When I exit the game without fully exiting (leaving it on in the background) my wall map all change to the same area and the map in my hand changes black.
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Thank you for your report! This issue was, however, reported at an earlier time as MCPE-12619. Feel free to add any information you find relevant in the comment section there.
If you did not do so this time, please perform a search to see if your bug has already been submitted prior to creating new tickets in the future.
I looked at the previous report you mention but the reporter said nothing about the maps on the wall all changing to the same area, so it looks like i just duplicated the same map and put it up there but they're all different areas. Should I create a new issue just specifying that?