Interacting with anything while using a quest focused map will cause the map to lose that focus.

Steps:

1. Have at least 2 active quests in the same area (fundamentally not part of the bug, but makes it possible to see the bug)
2. Open Journal, select a quest and click on the map button. This will open a version of the map that only shows the objectives for that particular quest and no others.
3. Interact with anything which causes the UI to refresh (disappear and then reappear). Commonly any sort of quest objective that you have to interact with will do this.
4. The map reopens and loses the quest focus, reverting to an ordinary map, showing all objectives.



I realize that this is an extremely minor bug, so I don't expect it to be fixed soon, if ever, but I thought it was good to report it anyway.