That shouldn’t matter. The password-protect function on posts should allow any viewer to view the post a long as they know the password. They don’t need a user account, so it should never ask them to log in.
I don’t want to create 300+ new users each month, I just want my individual customers to view the post I’ve created for them, without the general public being able to view it as well. This is exactly what the password-protected post is supposed to do.