[Plugin: Better WP Security] Hide Backend Bug !

I’ve enabled “Hide Backend” option and costom “Register Slug”.

But when I try:
https://domain.ltd/wp-register.php
I am redirected to:
https://domain.ltd/wp-login.php?[the secret key]

And when I try:
https://domain.ltd/[the secret key]
I am redirected to:
https://domain.ltd/wp-login.php?[the secret key]&action=register