I have this problem too. I've attached a screenshot of the completed task, which never loses the '!' and has no sub tasks associated with it.
Same issue on PC at the Nexus refugees was unable to heal the guy ie give the plant to the doc, but I fixed the com tower or whatever on the roof, everything including npc's becomes uninteractible when map markers dissapears at the Herbal Entrepreneurs after giving the UV Lamp so no backtracking to those guys to talk or pickup if anything is missed.
Well the completed task entry now includes a single sub task and the '!' has finally gone with 1.05. I still can't offer any medicine for the guy with the bite marks so there still seems to be something missing here.
Was this checking on a save where you already tried to do the mission and it glitched or is this a clean attempt at the mission from the start?
