In my case, it is because of Sazza. She was in the room with Minthara and got knocked out as well and her quest was never closed. I reloaded the save right before I knocked Minthara and speedrun it to Moonrise 3 times: Without taking Sazza's quest at all, knocking her out by Minthara and killing her by Minthara and the only case when Minthara is broken is when Sazza is knocked and left there. Unfortunately, I can't return and kill her from Act 2, because she despawns (the only one that does that, other gobos I knocked are still there) and I had like 30 hours of playtime from there. This sucks, I'll try to close that quest somehow, but I can't find Sazza anywhere and her marker is gone as well.
I went back to a save before Minthara knockout save and finally fixed it. The difference is as follow:
- Minthara no response play through:
- Tav started conversation with Minthara in goblin camp, another character pickup/steal item on desk. Knocked out both Minthara and Sazza. Other goblins were killed.
- Rescued Minthara. However, after initial chat, she don't response after.
- Minithara normal play through:
- Tav agreed to Minthara request in her quarter. Both Minthara and Sazza started to walk out of room,
- Sazza would stop at center area of Shattered Sanctum where Priestess Gut was. Just leave her alone.
- Minthara, two other goblin bosses and a few other goblins rallied to the exit of Shattered Sanctum
- Minthara would give a speech there before heading out with the goblins. Attack her there to enter temporary hostile state. Knocked her out.
- Interact with Minthara was normal.