While adding markers to locked maps appears to be by design, (or at least a diffrent bug) it does make this bug more problematic since there may be no way to re-create the map without the marker.
Furthermore, there are no commands you can use to fix this. The only way to fix this is to hand edit the map.dat file on the filesystem. (well beyond most people's ability)
(Anyone that wants to do this, I recommend NBTExplorer, open map file with it, find where the item frams is listed, and simply delete it)
octojen
While adding markers to locked maps appears to be by design, (or at least a diffrent bug) it does make this bug more problematic since there may be no way to re-create the map without the marker.
Furthermore, there are no commands you can use to fix this. The only way to fix this is to hand edit the map.dat file on the filesystem. (well beyond most people's ability)
(Anyone that wants to do this, I recommend NBTExplorer, open map file with it, find where the item frams is listed, and simply delete it)