I've been waiting for the patch 2 thread to be fixed but it doesn't look like anyone at Larian noticed it's broken yet.

Personally I have to say I expected more from the "new" Karlach ending...it's not really a new ending, it just adds a couple options to one of the existing endings and expands with a bit of a cutscene that elaborates on what happens in the immediate aftermath but nothing about it feels good or better than it did before. As of now Karlach still doesn't feel like a companion worth bothering with. But still a lot more to come for the game in future patches.

But if this is the end of Karlach content I'm not too fussed about it personally, my eyes will mostly be on the kind of content Minthara gets, THAT will be the one companion content that will mold a lot of my longer term feelings about the game...her, the epilogues, and whether Larian implement any of the Raven Queen content in the game before support for BG3 ends.