Ticket #51822: 51822.4.diff

src/wp-admin/update-core.php

@@ -229 +229 @@
 function core_upgrade_preamble() {
         global $required_php_version, $required_mysql_version;
 
-        $wp_version = get_bloginfo( 'version' );
-        $updates    = get_core_updates();
+        $updates = get_core_updates();
 
+        // Include an unmodified $wp_version.
+        require ABSPATH . WPINC . '/version.php';
+
+        $is_development_version = preg_match( '/alpha|beta|RC/', $wp_version );
+
         if ( isset( $updates[0]->version ) && version_compare( $updates[0]->version, $wp_version, '>' ) ) {
                 echo '<h2 class="response">';
                 _e( 'An updated version of WordPress is available.' );
@@ -245 +249 @@
                         __( 'https://wordpress.org/support/article/updating-wordpress/' )
                 );
                 echo '</p></div>';
-        } elseif ( isset( $updates[0] ) && 'development' === $updates[0]->response ) {
+        } elseif ( $is_development_version ) {
                 echo '<h2 class="response">' . __( 'You are using a development version of WordPress.' ) . '</h2>';
         } else {
                 echo '<h2 class="response">' . __( 'You have the latest version of WordPress.' ) . '</h2>';