Stuck in Ludern (Wartales)

Apparently, the quest in Ludern, "The Phantom Threat", came to the place on the map of the scientist, the scientist is with me in the detachment, but the interaction button does not appear, I got into the passage to see what the problem is, everyone has a clickable corpse near Garussa, I don’t have it, not a trace appears and no ghostly pack appears. Please let me know if you have come across it and how to resolve it.