I’ve noticed it over a few months now.
Just tested it again to confirm, did heroic public events, bounties, patrols, high value targets and other free roam events and chests and not a single one dropped. I know it’s RNG based but Heroic events always dropped 2 before and now I can’t get any at all.
Edit: I do have 20 of them in my vault. Is that why they don’t drop...?
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Hi there. Yes, the fact that you have some in your vault is the reason why they're not currently dropping.