Lucanis questline bugged?

Did you choose Tevinter over Treviso for the dragon attacks? If so, that would be why he's hardened, and not fond of you. Neve did the same with me when I helped Treviso.

I did choose Tevinter. Does that mean ALL companion quests with Lucanis are off table though? Because it's not simply that he's hardened (I'm fine with that, and he seems to get along ok with my Rook, and leveling up fine). It's that I'm getting absolutely nothing except from a dialogue or two about Spite. The game hinted there should be a scene at some point with Emmrich, but I've never seen it despite checking regularly at the Lighthouse.

I think his personal quests are canceled if you let Treviso fall because his personal quests involve Ilario, Viago, and Teia. If Treviso falls, I assume one of them are dead or blighted and there isn't a back-up NPC for them to be in his quests. 

They're all alive though, talking to me, giving me some quests from time to time. Lucanis really wants to deal with Ilario. Just no official Lucanis-specific quest apart from the one within the main questline (the one in parallel with Davrin's).

It's especially weird since all the other companions are advancing fine and Lucanis is about the same bonding level.

Update: I'm almost at the point of no return in the final act. I've had the quests "A murder of crows", saved Treviso from the governor and had a really weird conversation with Lucanis about Spite which seemed to build on some other earlier conversation that I've never seen or heard.

Looking around online, it seems there's an entire quest that never ever showed up on my log: "Inner Demons". Did anyone miss that quest? And as always, there was zero "outing" with Lucanis and no added dialogue (apart from another really weird bit where he has an bubble exclamation mark over his head - signaling dialogue - except all he said was "I really need to deal with Spite" and nothing else happened).

I want to play a Crow romancing Lucanis in my second playthrough and I'd really like to know if something is bugged with my game or not.