Mine came with a patch of those same bumps under the wallpaper in the rear right corner beside the couch. The bumps are as hard as rock. I think it was a foreign material that got vacuum trapped under the wall covering upon assembly of the laminate panel. I know I have no leaks. Yours looks the same from the pictures.
2018 Ram 3500 MC 4x4, CTD, DRW, w/ Max Tow
2018 Jayco NorthPoint 315RLTS