WP 5.x mixed Content Error on correct configuration

After a very very intensive search I found the issue of the mixed-content error on WP 5.x when your site is correctly configured.

In the file dxuc-unanswered-comments.php is a function called add_top_active_link_script. This is supposed to load the necessary assets. In the DOM, all links are displayed correctly, but if you look at the request, you can see that the urls are incorrect:
https://www.my-page.de/wp-content/plugins/dx-unanswered-comments//js/dxuc-script.js?ver=5.9

notice the // before js.

So all you have to do is remove the / before the assets folder in the mentioned file and everything is working as intended.

Would you please add this fix in your next release? Thank you!