Ticket #44956: 44956.diff

wp-includes/option.php

@@ -1583 +1583 @@
          */
         $value = apply_filters( "pre_update_site_option_{$option}", $value, $old_value, $option, $network_id );
 
-        if ( $value === $old_value ) {
+        /*
+         * If the new and old values are the same, no need to update.
+         *
+         * Use same approach as `update_option()`.
+         *
+         * See https://core.trac.wordpress.org/ticket/44956
+         */
+        if ( $value === $old_value || maybe_serialize( $value ) === maybe_serialize( $old_value ) ) {
                 return false;
         }