ok, i tried some stuff and what i can tell so far:
it only works once.
it works even if your picture is at 99%.
i tried demz 1954 asset which is 100% if you just use it. i stamped layers until i had 99%, then did the glitch and added the asset. it worked and i now a picture with 99% percent layers plus a 100% asset.
the second has 2x117=234 layer!