The answer is that all bounties you have where the objective has been met is considered "complete", and is safe to hold until after TTK drops. heres the proof
https://twitter.com/knowsworthy/status/639614139602604032
[i]Original post deleted because 20% of this community are only interested in being hurtful pieces of human trash[/i].
Edit: I want to thank the people who answered without being rude, and also a big thanks to people who have commented to say they had this same question, too.
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2 RepliesI 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