That is unfortunate but it does happen on occasion. I've seen/heard liftgate glass shatter on vehicles just sitting still in parking lots. I see in the pictures that you have a bike inside. Is it possible a load was placed on the glass from the handle bars? seems like a possibility from the pictures.
Fixed glass, rear and non-opening side glass along with windshields can break due to thermal stress.
It happens, not often, but it does happen. Comprehensive insurance is cheap and I always cover my vehicles, even beaters.
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