Curious physics?
Ordinarily these things are designed so that air pressure holds them in place - even looking at the photos it is hard to figure out what has occurred but one plausible scenario is that the panel folded in on itself to be able to fit through the aperture. Obviously Boeing, NTSB etc are going to study this very carefully and it's why the FAA has grounded all Max-9s in case it's a latent design or material defect.
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Philip
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