tldr: Kill all illusions results in unlockable boss HP; unable to advance script. This is a separate issue to https://forums.daybreakgames.com/eq...-raid-boss-resets-and-illusion-health.288100/ although we encountered full boss HP resets also. We encountered an additional/separate issue with the same event. When we killed all illusions Jak's HP locked at the next expected increment. No new illusions spawned and we found no way of unlocking the HP. We tried intentionally leashing Jak, but he would stick again at the same HP lock. We tested it at 35-20% and 6% in two separate instances (dropping instance appears to be the only option once the event is stuck). In order to win we had to intentionally keep one illusion alive. If that is the design intention, then there should be a wipe mechanic not leave the event in limbo (and this would have implications for the event's achievements).
We tested this on Sunday and confirm it is fixed. Specifically, we murdered all 3 Illusions in each of the 3 waves, and boss died as we'd expect it to.