Yes. They are also the weakest part of the model. It is also the Wings that are the easiest to cause distortion when covering a new model if you get too carried away with the Heat-gun and "over shrink" the covering. So I think it was the combination of the wood becoming brittle and the contraction of the covering crushing the wing. I imagine the engine vibration "irritated" the situation too.
Wings can be very airtight actually.
Not that airtight, not enough to crate so much vaccume to crush the wing simply by a temperature drop. Especially if there are Servo Pockets in them and passages for control rods, etc, and other hardware that makes penetrations.
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