Before I make a bug, thought I'd ask the general you's... does your Guardian/Dream Visitor just rando show up in cutscenes at times temporarily taking the place of one of the other 3 party members? The first time I saw him walking with us I thought I was having a stroke from playing too much BG3.
Example: if Astarion is in my party, sometimes McDreamy shows up in the scene, but when the scene is over, it's back to Astarion.
I do have a mod installed: Whispers of the Divine (love) and my guardian is a strong Aasimar race. I haven't tested removing the mod yet, because I do not want to boink my Honour Mode save file in any way.
I don't mind Mr Dreamer hanging out... just took me by surprise since I hadn't actually met him yet