Have patience...Larian is working on companions missing content and have confirmed as such. I would expect that in the first two major patches we will see a lot of companion content fixed, including companion endings among other things. Larian have also been really good in their past games to restore a lot of cut content for the eventual definitive editions as well. For the moment being simply staying calm and waiting for the patches is the best approach. Also trust in Larian to fix up the game, they have always delivered.