I just had this happen to me (It didn't happen in the previous game) The only difference was that when I went back to Z'Ant, I had the Chaos Moliri already. I think he "forgets" about you being a double agent if you have it. I tried going back to him before getting it and he attacked me, so I reloaded a save game and I'm going to get the CM first and then go back and see if it helps.. I also killed the informant.
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