[2020] [Bug/Glitch]"Undo" button in the Editor also undoes mediatracker changes

If you create/change something in the Mediatracker and exit it, when pressing "Undo" in the regular map editor, game will revert not only block placements (as intended) but also any changes in the Mediatracker without any notice (that one should not be intended, undoing happens simultaneously in map- and Mediatracker editors with a single "Undo").