Potential XBox One fix
Just posted this in another thread, thought I'd post it here too in the hope it helps:
***Potential Spoilers***
So I was having the exact same issue, tried everything, nothing worked. I finally gave up and completed the game missing only that 1 completed mission. After you finish you can keep playing and complete missions you didn't finish or whatever. You can also reset all the outpost to hostile and replay them again by selecting "Outpost Master" from the pause menu. I did this and before everything even finished loading, a new voice over came reintroducing me to the mission, saying I was carrying on Virgils work or whatever. However now when I selected to track the mission it was like I had restarted it. I liberated the outpost at Jessop Conservatory again and Feeney immediately showed up because his crops were already burned. Shot him down and completed the mission. Hope this helps!
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