The actual root cause of the failing blueprint, visible only after the KeyOf references were gone: the entry set recovery_flow alone, but the serializer validates the whole object and rejected it with 'When no user fields are selected, at least one source must be selected'.
All other fields are listed on purpose even though they match the model defaults - whatever the serializer does not receive is reset to its default, so a blueprint naming a single field can silently flip unrelated settings. Values are taken from the live database.
Refs axion1337.chat/axion1337.chat-gitops#60