The green marker that shows on a map when the map is in an item frame doesn't disappear when the map is removed, nor when the item frame is destroyed.

This bug seems to be independent of item frame type (regular or glowing) and orientation, as well as map size. Banner markers do not have this issue.

Image 1: A regular map with no markers

Image 2: A map with one marker, indicated by the map in an item frame seen in the background (working as intended)

Image 3: Taken after the item frame is destroyed, the marker remains on the map

Image 4: Shows multiple markers referring to frames that have been placed and then destroyed; there doesn't appear to be a limit to how many markers can be shown simultaneously with this bug