Update 1/18/21: The refunds have now been clawed back, apparently they were an error.
Multiple readers reached out about annual fee refund credits on their Hyatt card (legacy version). A lot of people are confused by this credit or thinking that it’s part of a pandemic credit program, but it seems to be related to the conversion that took place on January 11 of the legacy Hyatt card to the World of Hyatt card. Chase is apparently prorating the annual fee, and then presumably a new annual fee will post soon to the card, perhaps on February 1.
Hat tip to readers Mike S and B.