Autoptimize does not aggregate registerred-only scripts

Depending on a script that is only registerred and not enqued, does not work with Autoptimize’s aggregate function.

wp_register_script('script-a', '/script-a.js'), array());
wp_enqueue_script('script-b', '/script-a.js'), array('jquery', 'script-a'));

In the example above script-a is missing when Autoptimize is active with aggregate (autoptimize_js_aggregate). Disabling Autoptimize or switching to defer only (autoptimize_js_defer_not_aggregate). Fixes the issue.

I don’t know which version introduced this error. We are currently using version 3.1.11.