WordPress #deferload broken

Try reviewing the following tutorial:
https://www.wpbeginner.com/wp-tutorials/how-to-fix-failed-to-load-resource-error-in-wordpress/

I just had the same problem, in your child themes functions.php file, find the bit that looks something like this:

wp_enqueue_script( ‘bootstrap5-childtheme’, get_stylesheet_directory_uri() . “/js/bootstrap.bundle.min.js#asyncload”, array(), null, true );

change it to this:

wp_enqueue_script( ‘bootstrap5-childtheme’, get_stylesheet_directory_uri() . “/js/bootstrap.bundle.min.js”, array(), null, array(‘in_footer’ => true, ‘strategy’ => ‘async’) );