So whatever the latest fix did - it’s not it. Don’t have the vid, but maybe there is something in the logs. I’ve seen it happen at least two times during that play session.
Yesterday I witnessed 2 CWs pop out of existense on 2 separate occasions while I was looking at them. Both were ambient guys just standing around, but one of them should have been already aggroed because my mate had put a bolt through his head.