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.
I remember, yes, happened to D:OS2, too.
Of course I will love to change my Steam review then, but currently I really lack motivation to play, because I'm one of those guys who, for example, really wanted to have Khaleesi Daenerys a nice ending as well, etc... if you know what I mean.
Girlfriend calls me a "hopeless romantic" ffs. She is much cooler than I am and all that.