[Voeld] Medical Cache: The Injured Angaran in Eroesk

I had the same issue just now and may have found the problem. In addition to a number of Kett in the ruins there were also 3 Challyrions who appeared after a slight delay. In my playthrough 1 apparently spawned SE of the ruins (just take the SE passage until you look over the plains) instead of being close to the others. Once I killed it I could talk with the npc (Yeda?) who was lying injured near the medical cache.

Hope this helps!! 🙂