This issue is new, definitely.
Collective is usually hecka snappy. Debuffs are consistently applied on the very first shot of a burst when leech is active with no deviation other than in some extreme processing-overload scenarios. This is weird though, I was taking my Obligation through a solo GM alert Birthplace of The Vile, and the sudden inconsistency was really hitting me hard. Shame to see one of my favorite exotics catch a random bug, hope it gets fixed.
Proof: https://youtu.be/ApzOPL2FhH0
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Hello there, Thank you very much for reaching out to us and for the detailed report. I'm sorry to hear that you are having issues with this particular weapon's application of Weaken after a recent patch. We've taken note of this report and will continue monitoring any underlying issues that may be occurring. For any updates that may come from this report, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News page[/url].