Catalysts needing guardian kills reset , I have 5 or 6 started that needed pvp kills that I’ve been avoiding. I finished Lorentz Driver and it reset as well as all the Cryosthesia. I’ve been sitting on these few catalysts for a long time and really don’t like pvp in destiny and want to play it as little as possible , I really don’t want to do these a 2nd time or finish the harder ones to have this happen to them.
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Nothing reset. You probably just got to another step in the quest line.