The String of Curses effect doesn't activate upon killing a Vex Harpy. I think this is the only enemy that this happens with, but I'm not sure. Checked to make sure this wasn't a one-off, it consistently occurs with Harpies.
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#bugreport
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Mine doesn't work on any of them, for me its just not doing the instant reload at all when I kill enemies on Venus….. I'm hopping they fix this with the upcoming patch.