Indeed, it's a bug, that can happen for some reason. I've never had this during my playthrough, but there have been similar reports once in a while. Not sure what triggers this problem...
I recommend reporting this to CDPR support. The official support website can be found here:
https://support.cdprojektred.com/en...i-am-unable-to-complete-progress-in-a-quest-8 (there's not really a support topic for the exact same topic, so this one will have to do - the same article can be found for consoles too).