Petro becomes blind if I manually change the sight settings

[some1]

If I go into the front cockpit and manually play with the sights, then after I'm back to piloting the helicopter, Petrovitch is unable to find targets any more. I think it's related to sight zoom level, because I managed to "fix" it in the attached track by changing the zoom level back to wide angle. 

1st attempt at searching for targets after taking off - Petro OK.

2nd attempt at searching for targets after changing sight zoom to narrow FOV - Petro Blind

3rd attempt at searching for targets after changing sight zoom to wide FOV - Petro Ok again

 

PetroBlind.trk