When in a room take a cabinet to the editor and change something - now the cabinet shows it is a modified cabinet (MOD 1) in the name. Save the cabinet and the (MOD) clears - apply changes to the room - check the cabinet in the room and it still shows it is a modified cabinet.
The only way I can clear the modified label is to delete the cabinet and insert it again from the saved file then it shows no modification like it should.