No unique item in unique map

slain any monster
opend any chest
crushed any urn

bug-id 1.426.919.179

Can't see the mission log, but is that a Zana daily where you need to find the unique item?

If it is just a regular unique map, there is no guarantee that there will be a unique drop - but it is certainly a bug if it is the Zana mission.

if its a zana mission make sure to open every chest and break every pot. Sometimes the unique doesn't drop from mobs but from other objects, strongboxes included.

Coward's trial is the only map you're guaranteed a unique item.