In Codeunit 5341 ("CRM Int. Table. Subscriber"), the event subscriber "OnAfterTransferRecordFields" sets the "AdditionalFieldsModified" variable to true or false. But it should ONLY set it to true if it makes changes. "AdditionalFieldsWereModified" could have been set to true previous to this function, and this function could incorrectly set it to false.
All other subscribers that involve the "AdditionalFieldsWereModified" variable handle this correctly by switching it to true, or else leaving it as-is.