I suspect that you rook the photo with the intention of being an extreme wide angle panorama picture with distorted lines and no obvious focal point. So, why do you feel the need to crop it to be anything other than the panorama? If you really...
Yeah this has to be damage caused by crushing the bag while stored or such.
Stress cracks would be a fine line but it wouldn't separate that far, there had to be some force applied.
when exactly did the damager occur? Did you purchase it new? Who was the seller? Did you examine all of the flight logs to prove that you had no in-flight accidents? Do you have pictures of other angles to show damage? Exactly where and how...
I find it highly doubtful that this sort of major cracking can happen through normal wear and tear and exposure to air and light. I would guess that UAV has, at some point or other, perhaps been rammed into a bag too hard, or been put in a...