As you can see on the screenshot bellow, I'm holding an activated map and it's invisible.
I've created the world with texture pack "Plastic" (official from Minecraft) enabled. Noticed the bug, thought that it might have come from the pack and disabled it. Same thing with vanilla pack.
Sorry if the issue has already been reported. I searched around and couldn't find.
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Thank you for your report!
We're actually already tracking this issue at MCPE-69412, so we 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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