Flash latest Samsung stock first and then try the whole procedure again starting with TWRP.
My experience is that TWRP 22.214.171.124 works fine, 126.96.36.199 doesn't at all.
TapaTalked from i9506
You're my hero, it worked! Thanks!...
Apparently, pressing fix root in recovery no longer sends it into a bootloop, just a heads up.