I'm working on incorporating this into a mod pack I'm developing and I noticed experience given by non-survival means is not usable to level up any of the eight skills. Both the /XP command and FTBQuests' XP quest reward options do not accumulate XP that can be spent on leveling up skills. Killing mobs/bottles of enchanting still grant XP that can be used to increase skill levels as one would expect.

Currently having the same issue as well with V1.7. I am running 1.19.2, forge version 43.3.8