Right now starting a clean game without mods and it works, but when I put "bread and butter" to a mods folder it starts again, no fir marker if I loot from PMC's.
I had that same issue when using the older "bread and butter" mod with the 1.5 version of SKI. Even saw a comment from someone mentioning it. Started using "FinsAI" instead (because butter didn't get updated at the release of SKI 2.0) and don't see any issues with items from PMCs being FIR.