Converted lich still active

[Caripillar]

Converted a lich earlier, and like the title says, once I was out of that mission he was still an active lich for some reason. Screenshot shows this bug, all 3 requiems correct and I know for a fact I held A for conversion during.

Edit: I lured and converted him again and that seems to have fixed progress, bit annoying to have to waste extra time doing that though. Unsure if it consumed requiems twice or returned items twice because I was not able to check the first time as I only discovered it after the fact.