"Hide login area" enabled, can't log out v.4.0.2

Hi there,

As many here I have problem with the option “Hide Login Area”.
Since enabled, I can’t log out from wordpress, the returning url is /wp-admin.

Server is nginx, custom .conf files updated, nginx restarted after rules changed.
Trying to log in with another navigator (Firefox, Opera, Safari…) with the custom url: I see the login screen, but can’t get in.

If I disable the option, then I can log out and log in again…

Any idea please ?
Thanks

https://www.ads-software.com/plugins/better-wp-security/