Minthara is one of my two favorite characters. I’m honestly tired of going through patchnotes and being disappointed over and over again. It’s been so many months, and yet they fail to properly adress her.
I sometimes feel like Larian thinks they fixed her bugs, when they clearly haven't. Especially looking at the patch notes for patch 4 and 5, where they mention unlocking some minor content that I've not seen anyone actually get to work.

I was looking forward to patch 5, thinking that surely this time they’d do something, since they added a new recruitment method, and thus more people would get to experience her. Sadly, I was very wrong. It feels like she constantly gets the short end of the stick. I feel like the fact that she was locked behind a choice that most players don’t take is one of the reasons she just gets treated as an orphan.

That being said, from what I've seen from datamines with the recent patches, they seem to still be rewriting some things that are not yet reachable in the game.
The lines for the poisoned kiss, specifically, have been different before patch 5, it's still unreachable though.
So maybe it’s just taking them longer than anticipated to implement things. I don’t know why it would be taking this long, however. And I hate the fact that Astarion is slightly bugged for a short period of time, gets fixed rather quickly - mind you, still has the interactions, they're just not displayed properly - but with Minthara we don't seem to get anything at all.