I have watched numerous videos and also read TWABs, and noticed the mention of D2 needing a complete redownload due to certain changes, I wonder will that remove completed bounties? I know that bounty soon won't be the main XP grind anymore but I still have a habit of hoarding them.
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To be safe I would re-download the game then complete a set of bounties on each character if you want to go that route. As with every new season, hoarding bounties is always a risky strategy.