(Spoilers for Act 2)

So I advanced through the quest line until Halsin says to meet him at the lake side by the Last Light Inn. Go to pick up that quest, and he's nowhere to be found. In my camp, he was just standing there where he always is, had the quest maker over him on the map, but no quest advancement dialog options.

I proceeded through the rest of Act 2, checking back at Last Light Inn area after every quest finished, still no Halsin. I go their the whole Moonrise Towers bit and fight Ketheric, and there he is in the lobby at the end. I talk to him and he's all, 'Oh, I can't come with you because I have to stay behind and try to lift the curse.' I even follow the prompt offering to help him, and he says, 'No, you've got to go on to fight the big bads, I'll stay here, this is my fight.'

I eventually just proceeded on to Act 3. It's really disappointing to have to leave a huge story aspect unfinished because the quest NPC never shows up where he's supposed to.

Does anyone know when this is planned to be fixed? I'm hoping to be able to get this on my next playthrough.