Baldur's Gate 3 is without a doubt a massive game. According to the founder of Larian Studios, they have all the dialogue options and lines of the narrator three times more words than the Lord of the Rings book series. However, it takes a whole series of “right” decisions to trigger some interactions. It is so very likely that we are still away from our favorite companions they didn't hear everything.
However, if you don't want to test different scenarios, there is still an option to look in the game files. He did exactly that Chubblotwho posted a video on YouTube last year where Karlach “breaks the fourth wall” and speaks directly to the player. In addition to looking directly into the “camera”, you are between the lines he realizes he is in a video game. This doesn't faze her, however, and instead, seemingly on behalf of Larian, she asks us if we're having fun. She is excited about the positive answer, and after the conversation ends, she is again the good old Karlach, whom we know well.
This interaction was considered content that ultimately did not make it into the game. However, she changed that reaction of the actress, which Karlach played. The one on platform X congratulated her for finding the conversation, but announced that she would get to it express in more detail only when someone triggers it organically.