Shatterer never spawned
Sat around for this to happen, and then right afterward the exact same thing happened with Triple Trouble.
Something is really bonked with world bosses today.
It happened because everything breaks when a NPC crucial to events happened to die AFTER their events completed.
This used to happen to Scholar Brogun during the Frozen Maw. The devs got it fixed so that the NPC continues to do what he’s supposed to do. I guess they haven’t got around fixing the same issues for the NPCs for Triple Trouble and the Shatterer.
How often are these events stalling? I’ve done both several times in the last couple weeks and none had any issues.
These are the time using the in game bug reporting would be useful as it should give Anet more info regarding the specific map instance you encountered these bugs.