Since the demo opened, players have used the in-game F8 report to tell us about problems — precisely described, some with reproduction steps. We chased them down and fixed the most serious one.
Still investigating: players also reported a dawn reward that stayed on screen, and a mission that wouldn't end once its conditions were met. These may share the root cause above; we'll keep watching after this fix goes out. If you still hit either after updating, press F8 and tell us whether you were solo or in co-op.
On balance: we've also had feedback on the Endless difficulty curve. We're reviewing it and will follow up once we know more.
Report anything with F8 or in the community hub — we read everything.
Hold until dawn.