SM.79 in 4.09m

[Fearfactor]

The "open cockpit' command does not work for me. I flew a Corsair for a minute and opened and closed it's cockpit a few times to confirm I was using the correct command. Then I flew the SM.79 as both upper and lower gunner and the command did not work. It only opens for me when a enemy approaches. Why are people saying the command works when it doesn't? Unless I have a strange and unique bug that only affects my game??