Ticket #52135: 52135.1.diff

src/wp-admin/includes/class-wp-site-health-auto-updates.php

@@ -90 +90 @@
          * @return array The test results.
          */
         public function test_wp_version_check_attached() {
-                if ( ! has_filter( 'wp_version_check', 'wp_version_check' ) ) {
+                if ( ( ! is_multisite() || ( is_main_site() && is_network_admin() ) ) && ! has_filter( 'wp_version_check', 'wp_version_check' ) ) {
                         return array(
                                 'description' => sprintf(
                                         /* translators: %s: Name of the filter used. */