Sacred Mirror bug

My friend ran a 83 forbidden sanctum, got 14 chaos, 30 alt, 30 chro, 20 fus, 2d reward when completing the whole sanctum. He didn't choose any reward when completing the floor.

Then he converted 1 minor boons into sacred mirro boon, found no reward was duplicated.

sacred mirror doesnt work for me too... so sad, got it 2 times in a row :)