Possibly related to #41.

In Mechagon with characters that haven't unlocked it via the intro quest, rares without chat triggers never produce notifications, and the VIGNETTE_MINIMAP_UPDATED events never appear in the debug log like they do on characters that have actually unlocked Mechagon.

I would expect nameplate detection to work for these characters, but even mouseover events don't appear to work in this context.

Here is a debug log from 25 minutes of camping and then killing Rustfeather, with Rustfeather never generating a notification:
mechagon.txt

Interesting. I don't think I've been there on a character who hasn't properly unlocked it, so I'd have to put some work into reproducing that.

Were you seeing the vignette stars on your minimap? It's possible that the initial quests "unlock" the rares, and they're all flagged as being regular mobs with no loot until then.

That seems to be a factor. There are no minimap stars for these characters. However, I have seen blueprint drops (which can't even be turned in yet for them) and azerite/parts, so I suspect the full loot table is still there. The mobs seem to have the same unit Id as they usually do as well (based on Rarity updating its count as usual).