Defeat the Trialmaster challenge not triggered

Reference number: 3 079 103 987

I defeated the Trialmaster in T16 rare map, but where is my challenge completion?

Did you have any response from ggg?!

I did the same and nothing!

any response had the same bug

I cannot tell from the screenshot, but is the map at least rare? I did the challenge a few days ago after speccing into Ultimatum on the first Trialmaster spawn.

So if it is bugged, it's a conditional bug. Maybe if scarab/sextant forced? Mine was a natural spawn (wandering path with all of the chance nodes).