Sometime in roughly the past week. The Assault (both Serpentis and Guristas) was quietly altered. Now, one must destory all ships in the last pocket, not just the left group. Sometimes a spawn will occur, sometimes not. If it does, it seems this spawn must also be killed before the mission will be marked as complete.
See my recent thread for both details and the math I calculated to determine if this is still a blitzable mission.
The TL;DR is that no - it should be pretty much removed from your blitz-list, but if you still run it, it’s not hurting you an insane amount. It’s best purpose is probably to give you a good standings boost when you really need it.