This might be the case if the factions outside the conflict received no input to change their influence levels. Under such a condition it's possible that the conflict is closed.Yes, I know the factions involved in the conflict can get influence from other factions if said factions lose influence, because lost influence is bled into the rest of the factions of the system. I do not agree that it is now an open system and doesn't have any special rules (if that's what you guys are saying), because in 2.2 I have been able to reduce the once controlling faction to 1% in a single conflict, bypassing every other faction, and the sums of the influences of the factions involved in conflicts I've monitored remains more or less constant.
But we just don't know for certain.