The Ether Resupply event in Watchers Grave on Nessus is broken. Initially, a giant servitor spawns and takes damage. shortly after a single smaller servitor spawns to shield the boss and make it immune. After killing the smaller servitor, the boss servitor remains immune to all damage indefinitely and the public event cannot progress. Additionally, albeit a smaller issue, is that the fallen dropship that flies in to drop off enemies clips into one of the walls significantly when it stops to spawn enemies. This issue has been consistent with this event over the last few days while I've been trying to complete the weekly challenge for completing activities on Nessus.