data is not a plain object, its _id is not a non-empty string, or it owns
_CHANGE_TYPE or _CHANGE_SEQUENCE_NUMBER. The target must add the change fields to produce a
valid CDC message.
Fix — wrap primitive, array, or binary values in an object field; use a non-empty string _id
(or omit it to let the target derive one); and remove the target-owned change fields from the row.