Lemoyne Raider camps no longer spawning.

[Void]

I'm in chapter 4 of the story mode and for some reason the Lemoyne Raider camps have stopped spawning completely. I have 2/3 completed and only need one more for 100% completion. I've already searched the recommended spots dozens of times now:
West of the "D" in Scarlett Meadows
Southwest of the first "A" in Scarlett Meadows
Eris Field: just east of the "g" in Ringneck Creek
Northwest of Radley's House
Every spot is just empty. Has anyone else experienced this? I feel like this is a glitch but I don't know for sure.