diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-admin/network/site-themes.php
--- a/wp/wp-admin/network/site-themes.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-admin/network/site-themes.php	Fri Sep 05 18:52:52 2025 +0200
@@ -143,7 +143,7 @@
 			}
 	}
 
-	update_option( 'allowedthemes', $allowed_themes );
+	update_option( 'allowedthemes', $allowed_themes, false );
 	restore_current_blog();
 
 	wp_safe_redirect(