I viewed such a bug on a Twitch stream. Avoiding spoiler details... The streamer was completing the Delemain (sp) questline and had to roll back to a save just

I viewed such a bug on a Twitch stream. Avoiding spoiler details... The streamer was completing the Delemain (sp) questline and had to roll back to a save just before the decision at the end due to a softlock that happened in the scripted sequence after.