Not getting corpses of my summoned spectre in my desecrate ?

I currently have a Demon Harpy spectre summoned, but when I use desecrate in my hideout, or anywhere for that matter, it doesn't show up at all.
It's the only spectre I have summoned with that gem, so shouldn't it be 100% chance to get a Demon Harpy corpse in my hideout?

I only get the default desecrated bonestalkers.
https://imgur.com/vrsGLQt