B-24 only (that I know of)
1. When on A/P with Alt. Hold engaged (X key), and then going to the bombsight (F6), the alt. hold disengages and allows the airplane to begin a gradual descent, picking up speed. This obviously screws up the calibration and causes bombs to land short.
2. Drones fail to lock up, especially when more than 3 bombers takeoff; drones also fail to land with lead bomber, but instead fly off and explode or land in grass.