Hello both,
We have tested the plugin with this version and it all works fine on our side. We have tested the plugin with WP5.6 too and it works.
There was an issue with WP5.5 caused by a deprecated jQuery method and it was fixed (before the new WordPress release).
Please make sure you have the latest version of the plugin installed and that there isn’t any conflict with any other plugin. If you are still experiencing the issue please reach us at https://wpdarko.com/support
Note that both these issues could be unrelated. It’s also possible that these issues appeared before 5.5.2.
Keep us posted. Thank you both of you for your feedback!