Beyond's corpses don't spawn with desecrate. (PSN)

In the Kalandra league I was able to capture a specter of Beyond (harpy demon) with great difficulty since there are no corpses left and the desecrate does not generate them even though I already have it. He is also not visible, you can only see his location when the specter uses his skills in battle.
I'm making this thread because a few days ago I started in the Mayhem event and I was able to capture Demon Harpy in a normal way and, in addition, I can also generate their corpses with desecrate and see the spectre skin. Which leads me to believe that this bug with Beyond's corpses only occurs in the Kalandra league.