dark talisman

I've played through Stardew Valley a few times but now I encountered something I believe is a bug. I finished the community center, triggered the cutscene with the wizard at the train station for the dark talisman quest but if I continue it and talk with Krobus nothing happens. He doesn't...

I am experiencing an issue where the dark talisman quest will not activate. I have finished the community centre, I'm on the new beach island, I have visited the mountain at different times of the day and I have almost full hearts with the wizard. Can someone please help me?