Hello. I posted this on #mod-discussion on the infinity-engine Discord, looks like this is a better place.
So, what happens:
I beat Sarevok, and when entering the Ducal Palace, Liia, Belt and Eltan are not hostile, but approaching them with anyone in the party causes Liia's Spell Trigger to fire, and _then_ she and Belt (_not_ Flaming Fist or Eltan, in fact, Liia and Belt attack the enforcers) go hostile.
Another update since this happened, I went back to the save file (attached) and a while after the above happens, ~~Winski Perorate~~ of all people dimension doors in, flamestrikes charname, screen fades and game over movie plays. I found this interesting because on my trek through the Thieves Guild maze, he was _not_ dying by the entrance to the Undercity as expected. Maybe relevant, I don't know.
Additional 'don't know if relevant': during Chapter 7, I had Flaming Fist chase me all through the city, and one of them came into the Ducal Palace with me for the coronation. I walked around to get another enforcer to attack him as not to lose rep and maybe get everyone hostile at me. During the doppleganger fight the log told me he died.
Very funny bug, would play through again 10/10
000000050-bg1 done.7z
WeiDU.log
WeiDU-BGEE.log