While I do agree with Henry's point that Minthara should know a lot more details about the antagonists from her position within their inner circle, the delivery of this information to the player in a spoilery fashion is clearly an unintended bug, as made evident by the triggering conditions presented by Crimsomrid above.
I was hoping that this issue would have been addressed in Hotfix #19, but any fix is a good fix I guess, and Salo did confirm that the team are also aware of and working on this particular bug as well.
Here’s hoping for Hotfix #20 to finally have this critical issue solved!