Sorry but that would be the presumption as other than impact damage or the insulation full of moisture there’s not really any other way that can happen. There are instances in some cabinets where it can do but if that were the case it’d be a well known issue and happening to slews of the same cabinets and they’d sort it out on way or another.
BSH cabinets though, I am unaware of any such issues.
In the absence of a visible issue or many instances they will then reasonably assume it’s impact damage as there’s not any other reason they can see.
K.