I found two chests in a Stronghold that contain a map both. The game completely freezes when I click on any of these maps to grab them, then it closes after a few seconds.

The map name reads "Unknown map".

This also happens to my friend, who plays from an Android device.

Im playing on a Realm of my property.

UPDATE: I downloaded my world and went to try and grab the map on local play, and it happened the same, so probably not a Realms issue.

This is not the first time my game crashes upon trying to grab a map; the first time it happened was with one of my own maps; however, it was a long time ago so I dont remember much about it anymore.