Did a consignment yard mission with power outage mutator. It went normally until we got to the finale. The progress bar filled in all the way and then disappeared, but the event never ended. It just kept rolling through the same spawns and specials over and over again.
I’ve encountered a similar bug before, but in that previous case no enemies would spawn other than a few specials, it just softlocked without us being able to call the valkyrie and leave.