Aborted Side Mission Disappears

I was on a Side Mission in the First Act and died. I then aborted the mission and quit my game, expecting to try again later. When I restarted the game, I was immediately moved to the next Story Mission. Now I’ve missed out on the Rescued Soldiers, the XP, and the Gear I would have got from that Side Mission. Has anyone else encountered this? Is this Working as Intended?