Playing on iOS…
I had only one crash and when I went back in it let me finish. I didn’t lose a sigil, in other words. I did have several times where the game hung for a looooooooong time on the reward load. Then it finally timed out to an error. Clicking try again always worked. So I am going to assume in my one crash, my actual victory condition managed to register somehow before the crash. One thing for sure, something sketchy was going on for the entire event.
The last time I had a bug report that essentially resulted in lost sigils, support said they could only reimburse what I would have got from the battle itself, like some souls and gold. They couldn’t reimburse the gems I spent, because I got other rewards from buying tiers.
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Apparently it’s not just faction assault, just had the same bug while trying to complete the “Complete a Delve at level 60 or higher” campaign objective 