The Fallen-based defeats challenge that came out at reset doesn't grant any progress towards the objective, even when defeating "tougher combatants."
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Hello there, Thank you very much for reaching out to us and for the detailed report and video. I'm sorry to hear that you are having issues with this seasonal challenge. We've taken note of this report and will continue investigating any underlying issues that may be occurring further. For any updates on this issue, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News page[/url].