@xian this is pretty recent at my local store at least. it's probably only been a month or two since i bought the one on top. it was also a single, i don't really buy doubles since i don't consume enough knekkebrød for it to be worth the pantry space.
it's really obvious though. because most of the wasa knekkebrød packages are now pretty square, but they were clearly rectangular before. some of the packs were still rectangles though, like husman and havre.
it seemed like all the lighter ones were square. so i'd guess the ones that rely most on plain wheat are shrinkflated. the healthier stuff made of more whole grains or rye appear unchanged