Bug Report ID: #1709890977 No essence drop from essence monster kill

Bug Report ID: #1709890977
Killed an essence monster in a tier 1 map with oil barrage, while it was heavy stunned, but their essences didn't drop (it showed 2 greater essences before release). Didn't use vaal orb before releasing it. I don't think so, but I might've use "devour" on the body as soon as it died. And I'm sure they aren't hidden by my filter.