I believe it is for example "kill 10 champions or ultras in a night fall activity". You have 6/10 killed when TTK drops. That bounty will be abandoned. However, you have "kill 10 hive champions or ultras" and you killed all 10 and you just have to turn it in to the tower. That will stay as the objective is completed just not turned in
English
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Yeah, makes sense now that I've seen a response from a Bungie rep. Thank you sir
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No problem