wp-includes/class-wp-navigation-fallback.php:296Gets the rendered markup for the default fallback blocks.
string private static function get_default_fallback_blocks() { $registry = WP_Block_Type_Registry::get_instance(); // If `core/page-list` is not registered then use empty blocks. return $registry->is_registered( 'core/page-list' ) ? '<!-- wp:page-list /-->' : ''; }Introduced in 6.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-navigation-fallback.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.