From experimenting with penetration values via ‘Protection Analysis’, I discovered a oddly cut hole in the front glass pane of the Lightning F.6’s cockpit canopy…
Lightning F.6
I’ve tested also with the Lightning F.53 (Premium) to see if it would produce the same issue but it does have armour/projectile collision…
Lightning F.53
I assume it’s most likely is a damage model bug of some form.