Sry for late reply, I was lunar eclipse hunting, and the next day I was very tired.
So yeah, right now I found an external drive with a old garuda install (it’s not updated) and both screens are working. At login, Wayland and x11. And he’s quiet, cold (like a grave) snappy and stable as it should be. So in that regard it doesn’t seem to be a hardware issue. More that something gets destroyed with updating..
Pics for reference with both screens working under garuda:
(notice how x11 symbols are small? Yea that’s how you can tell these are x11, I should have made pics with the terminal open but then I would have struggled to take pics of both screens at the same time.. Whatever, I now know it’s not the adapter, port or cable at least, my laptop is healthy)