diff --git a/lib/compat/wordpress-6.2/class-wp-theme-json-gutenberg.php b/lib/compat/wordpress-6.2/class-wp-theme-json-gutenberg.php
index 9c74468c683be3..167ee63e2a2cac 100644
--- a/lib/compat/wordpress-6.2/class-wp-theme-json-gutenberg.php
+++ b/lib/compat/wordpress-6.2/class-wp-theme-json-gutenberg.php
@@ -522,7 +522,8 @@ public function __construct( $theme_json = array(), $origin = 'theme' ) {
 		}
 
 		$this->theme_json    = WP_Theme_JSON_Schema::migrate( $theme_json );
-		$valid_block_names   = array_keys( static::get_blocks_metadata() );
+		$registry            = WP_Block_Type_Registry::get_instance();
+		$valid_block_names   = array_keys( $registry->get_all_registered() );
 		$valid_element_names = array_keys( static::ELEMENTS );
 		$theme_json          = static::sanitize( $this->theme_json, $valid_block_names, $valid_element_names );
 		$this->theme_json    = static::maybe_opt_in_into_settings( $theme_json );