I print PETG on our Prusa textured PEI sheets regularly & wipe with ipa when needed, have never experienced this. A proper pei sheet should “just work” stuff sticks when it’s hot and doesn’t when it’s cold, at most requiring a slight bend of the plate to pop prints off.
My suspicion is that Bambu uses cheaper or less (both?) pei coating on definitely cheaper & thinner magnetic sheets, they likely thought it was good enough for most people and it is, but it can still cause issues and degrade faster (cheap parts is how they keep the machines affordable after all)
You can bend a Bambu plate in half with very little effort compared to others like Layerlock/Prusa, if they’re skimping on a thin sheet of metal I’d bank they skimp on the PEI spray that goes on it too