* Registers any additional post meta fields.
* @since 6.3.0 Adds `wp_pattern_sync_status` meta field to the wp_block post type so an unsynced option can be added.
* @link https://github.com/WordPress/gutenberg/pull/51144
function wp_create_initial_post_meta() {
'wp_pattern_sync_status',
'sanitize_callback' => 'sanitize_text_field',
'enum' => array( 'partial', 'unsynced' ),