Once a failure begins, pressure retaining stresses are concentrated at the edge of the bubble, instead of across whole area, and it continues to peel away rapidly.
The force = pressure x area is increasing by diameter squared, the holding edge is is only increading proportional to diameter. Bigger it gets, less pressure needed for it to continue to get bigger.
In other words, self destructs as soon as tiny failure starts. The localized stress ripping the foam /laminate apart is many x normal design once a blister starts. UL open cell foam not that strong.