No smilies in dropdown Version 2.0.4

I had problems with this plugin Version 2.0.4 and the Asgaros forum:
At first no smilies in the dropdown then only some smilies.

Solved by adding ‘relative’ to line 42 in tinymce-smiley-button.php

'src_url' => apply_filters('smilies_src', includes_url('images/smilies/', 'relative'), '', site_url())

Reference:
https://developer.www.ads-software.com/reference/functions/includes_url/

Second parameter $scheme in includes_url defaults to null
and you will get your site URL ie http/https …
and the ‘relative’ address will get: /wp-includes/images/smilies/

Site URL is probably bad because my development site has directory privacy active.