Hello,
So, I did this part on my alts, but this character seems to be unable to do this quest.
I got the “A Dying World” quest from Magni Bronzebeard and usually at this point there’s a teleport in the BFA zone that brings you to Silithus, but now there wasn’t. I wonder if that was because I was in Cataclysm timewalking, so I changed it to present time. However, the teleport still did not show up. So, I decided to fly there. I flew over to Magni Bronzebeard in Silithus and once I had spoken with him about the “A Dying World” quest, he didn’t give me a new quest. At this point he’s supposed to give me the Heart of Azeroth quest, but instead he gives me nothing. No quest pops up.