Possed map boss in ritual - Cross Contamination (buged?)

I cannot complete "Defeat a Possesed Map Boss while in a ritual.
I tried in different methods to make possesed boss appear in ritual but nothing worked.

I tried by map mod Unique Monsters are possesed. In normal fight, boss is possesed, but when I activate ritual, he is not possesed anymore.

I tried by Gilded Tourment scarab. Two times ghost appered in boss room and possesed boss. Same situation like last time, no completion.

I don't know it's bugged or I am doing something wrong.

Yep, same. Not sure if bug or I'm doing something wrong here.

+1, I had a possessed dunes boss, activated the ritual, and killed him. no completion granted.

I've had the same thing happen. Tried killing a possessed boss from map mod in the ritual.

Tried killing one possessed boss in ritual then dragging the other dual boss outside of it. Started the ritual killed 2nd half of possessed boss pair in it. No credit there either. (strand map)

Tried again on Glacier map with possessed map boss mod. Again no credit.

Bug report reference number is 1,777,717,718.