MySQL 9.1 Release Notes
In MySQL 9.1, it is possible to log partial updates to JSON documents (see Partial Updates of JSON Values). The logging behavior depends on the format used, as described here:
Statement-based replication. JSON partial updates are always logged as partial updates. This cannot be disabled when using statement-based logging.
Row-based replication.
JSON partial updates are not logged as such by default, but
instead are logged as complete documents. To enable logging of
partial updates, set
binlog_row_value_options=PARTIAL_JSON.
If a replication source has this variable set, partial updates
received from that source are handled and applied by a replica
regardless of the replica's own setting for the variable.