As mentioned in the title, I entered the Orb Vallis to do the lowest level bounty on public and joined another player, when placing the trap for the second objective the other player left and I was host migrated out. The trap was placed but the quest progression told me to "get to the site" when I was already there and the trap was placed. When I tried to walk away to cancel the bounty, it was still active both on the UI and when I went to get a new bounty near the gates. I had to walk back into Fortuna and start again.
What I saw: