It seems that this challenge can no longer be completed after Act II has started.
I completed 3 runs of the Breach Executable activity, which completed the 3 completions challenge for me. Unlike in previous weeks, there are no more tiers to the challenge after that, the challenge is done and gone after 3 completions. However, this does not (same as in previous weeks) complete the seasonal challenge Aggressive Exploration I, where as I understood it you could complete it by running the activity 9 times, completing 3 tiers of 3 completion challenges.
Is this seasonal challenge now simply not possible to complete, and is that intentional?
If it is intentional, did I miss a warning somewhere in game that some of the challenges related to seasonal activities must be completed by a certain date within the season, as opposed to previous seasons?
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I'm in the same boat with this challenge. Tried it to do it on an another character, and had no luck. Hope bungie fixes this because it's super frustrating to try, and do a bugged challenge.