So in two separate occasions after Xoti harvested a soul she wanted to speak to me. Didn't noticed it 1st time, but her dialog didn't trigger and she started generic one instead.

Here a two saves for 1st and 2nd time it happened.

Just go to the ghost in 1st one or essence in 2nd one and let her harvest it.  After which she will want to speak to you and generic dialog will start instead. 

https://drive.google.com/open?id=1akxshhkztnKupituhzg3-Qz8bgrNMc3a

https://drive.google.com/open?id=1cbtaaKvDID5SnPpcRqMFiruQOF8Rsvhx

I'm pretty sure that the same thing happened to me every single time Xoti wanted to talk.

Still the same in new Beta Patch 

Yeah, I'm pretty sure this is a known bug. It's been happening to me since the game's release. Not really a game breaker or anything, but definitely an annoyance. I am curious though, if the spell resistance bug for Xoti's Lantern has been fixed with the beta patch or not? Does anyone know?

Hey Dopsim,

 

We do have this in currently, pending investigation. We'll work at getting this resolved for a hopeful future patch!

 

Best,

 

-Caleb