Email is NOT sent to roles

This issue exists in version 8.x-3.6 as well.

When the 'Disable the site email address' and 'Email the author?' configurations are turned off, the selected roles do not receive any emails. Emails are only sent to roles when either of the above-mentioned configurations is enabled.

The email notification received by a user with the selected role has either the 'site email address' or the 'author email address' (whichever is enabled in the notification configuration) in the 'to' field.

I'm using 8.x-3.6 and so far this has been working for me.
I have both 'Email the author?' and 'Disable the site email address' OFF.

Maybe there's some more information needed to reproduce this?

The root cause of the issue was identified my case. When the 'Disable the site email address' configuration is enabled, the recipient field is left empty, as written in the module code (screenshot attached).
When the 'from' address is empty, some email providers (except Gmail) block the emails from being sent. Therefore, if users wish to use the 'Roles' email functionality specifically, the 'Disable the site email address' option must be turned off in such cases, based on the current state of the code.