The hotfix happened sometime in the afternoon (Pacific Time), and it added the new hidden quest tracker , which gets flagged as completed when you turn in the daily Feathered Fiend.
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With a hotfix today, Blizzard has added a new hidden quest tracker for the first time in the day you defeat Daetan Swiftplume. This likely means the event works similarly to other Holidays, having a higher chance to give its finest rewards, like Noble Flying Carpet, in your first attempt of the day.