Not a new bug but rather one that has carried over from AH1.
When you lose a flap to battle damage, the FM treats it as still existing only it remains at the last position it was set to. ie. if you have your flaps at the first notch and lose one to battle damage, the aircraft will still fly level until you retract the remaining flap. The aircraft will then roll away from the damaged flap, indicating that it is still modelled as operating in the airflow.
This is trure for the P51B at least but I also observed it in the D pony in AH1, dunno about other aircraft cause I rarely fly 'em.
Is it really that difficult to enter a teensy bit of code that says "IF(flap(n) is damaged, Flap(n) deflection = 0)" ?
mako