Task: Herbal Entrepreneurs doesn't let me take a plant sample

Yep, I'm having this same exact issue on PC. Talked to the exiles first, then randomly came across the SOS signal. I talked to the junkies, the quest popped up and went straight to the "completed missions" folder. The file for that quest is completely blank and it's marked by an exclamation mark that won't go away no matter what. Can't pick up the herb, can't cure the guy. I'm a completionist so it's infuriating.