I am a 100% certain she is supposed to have an ACT 2 romance scene during its finale which acts as a basis for further development, along with a scene the morning after... but it does not seem to be in the game at all.
I might be misunderstanding your wording, but are you implying she has another romance scene already coded in the game right now, and that it's blocked for some unknown reason? I personally find that hard to believe.
The main reason Minthara doesn’t have a romance scene in Act 2 might be due to how she was originally tied to slaughtering the Grove and you could already get one scene from that. Seeing as she's not an origin companion, like Halsin, one romance scene is likely all that they planned for her.
I could see them moving the romance scene from the Grove slaughter to Act 2 for players who recruit her with the KO method, just to fill in the gaps. But I think it's safe to say there are currently no additional romance scenes for Minthara as dataminers would have already discovered them.
It’s a different matter if they’re planning to
add another scene, they should, and I hope they do! The implication seems to be confusing for a lot of people, but I put the blame on the vagueness of Minthara's current state too. We have no way of knowing for sure which parts are bugs and which are just content that's not in the game yet.
I think whatever the “stupid bug” that was blocking her dialogue prior to Hotfix 5 is still blocking her romance flags that prevents us from accessing her romance dialogue tree. Even then, this is mostly wishful thinking. I don't trust much of what that article said as I also remember Swen exaggerated the number of endings we'd get. I'm pretty sure they just haven't done much for Minthara to begin with. I'd be happy to be proven wrong of course, any day now Larian.
Happy New Year to everyone, but especially the Minthara fans hehe :3