Same issue with the foam on the external tank and foam loss issues. An exemption was in place for years for the method for spraying the foam but eventually eco regs caused a change. I don’t think the foam was as stable after that.
Another thing about the foam is that most of it was applied by machine. But there were some areas that had to be hand-sprayed, and these areas were where the application was less uniform, and the foam was more likely to fall off.