Hi, I already solved. It was me.
On my theme I deregistered jquery, renamed jquery_js to load v3, and deferred it. I kept v3 but renamed jquery as default and loaded without deferring it.
Though, in next versions, I think you could maybe add an option to defer your scripts too. Nowadays performance is really important. Or, if you’re naming/registering your scripts the standard way, you could add some docs to report their names and to show how to defer them. Something like:
if(!is_admin()) add_filter( 'script_loader_tag', 'wsds_defer_scripts', 10, 3 );
function wsds_defer_scripts( $tag, $handle, $src ) {
$defer_scripts = array(
'your_mansory_script_name'
,'your_others...'
);
if(in_array($handle, $defer_scripts)){ return '<script src="' . $src . '" defer="defer" type="text/javascript"></script>' . "\n"; }
return $tag;
}