Ticket #38551: 38551.1.patch

src/wp-admin/includes/update-core.php

@@ -746 +746 @@
         'themes/twentyseventeen/' => '4.7',
 );
 
-// If not explicitly defined as false, don't install new default themes.
-if ( ! defined( 'CORE_UPGRADE_SKIP_NEW_BUNDLED' ) || CORE_UPGRADE_SKIP_NEW_BUNDLED ) {
-        $_new_bundled_files = array( 'plugins/akismet/' => '2.0' );
-}
-
 /**
  * Upgrades the core of WordPress.
  *
@@ -1037 +1032 @@
                 }
         }
 
+        // If not explicitly defined as false, don't install new default themes for non-stable releases.
+        if ( ! $development_build && ( ! defined( 'CORE_UPGRADE_SKIP_NEW_BUNDLED' ) || CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
+                $_new_bundled_files = array( 'plugins/akismet/' => '2.0' );
+        }
+
         // Copy New bundled plugins & themes
         // This gives us the ability to install new plugins & themes bundled with future versions of WordPress whilst avoiding the re-install upon upgrade issue.
         // $development_build controls us overwriting bundled themes and plugins when a non-stable release is being updated