It’s a b&w print. The area above the fuselage has been burnt in during printing (the print has been exposed for longer in that area), probably to bring out more detail of the target. This results in the shadow area on the wing and tail being darker than the shadow on the fuselage.
I’d concur with the theory of damage from a previous mission. Perhaps there was an engine fire or oil leak; the mechanics have fixed this, but simply not bothered to clean the surface. Not mission critical. The tail surfaces might have been given a wipe to make sure the elevators still worked.
Simply coincidental that the shadow should line up so exactly with the engine.
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