Just had this happen to me. The solo medusa kept pace at 465 m (inside the 500 m keep out) as i fa off boosted. I doopped the thargoid probe, sensor and link i was carrying on my way to activate another thargoid structure as soon as the shutdown pulse was over. The medua still went hostile and started shooting withing ~2 seconds, and melted my unengineered krait before i could manage to high wake. The goid did not respond to the cargo drop, and did not move off to scoop it either. I was skeptical but it does look like either a bug, or the goids are much more of a hair trigger. Now to spend 2 more hours finding another probe and sensor.