Sacred wisps turning into permanent entities

I can't really tell when they show up, but somewhere in the chaos of my maps these permanent wisps will show up. They can be targeted by power siphon and have collision. Sometimes you can get stuck inside them (I wasn't able to replicate this in the video).

https://streamable.com/dlpvkm (temporary link)

Extra context - I run ritual and a bunch of torment in my maps + tons of corpse consumption