[(The Jovian Concord: Update 25) Bug Report Megathread]

Made a tweet on this with an included video: 

Basically, using your operator after finishing the ropalolyst fight and falling off the platforms respawns you at the Arena, effectively softlocking your mission. There is no way to get back to extraction as far as I can tell, so if you aren't in a squad you're screwed. I've been able to replicate this bug multiple times, so it seems consistent.