User can’t access subsite admin pages when they have access to 1 subsite

[dozer247]

When creating a user with access only to a subsite, when that user logs in they are logged into the main site and the subsite select box doesn’t appear so the user can’t switch to the subsite they have access to use.

I expected the user would log straight into the subsite admin page instead, just like subsite 1.3.2 .

Here are the steps to replicate the issue.
With a clean install with the following

 "require": {
        "php": "^7.4 || ^8.0",
        "silverstripe/recipe-plugin": "^1.2",
        "silverstripe/recipe-cms": "~4.12.0@stable",
        "silverstripe-themes/simple": "~3.2.0",
        "silverstripe/login-forms": "~4.8.0@stable",
        "silverstripe/subsites": "^2.7"
    },

I created a new subsite and added a new subsite domain.
As the administrator under the main site i created a new role e.g.(web master) with the following permissions

Then switching to the subsite admin page by using the subsite selector i added a new security group say subsite editor.
The security group subsite editor had no Parent group and i assigned the web master role i created earlier.
In the subsite security group tab i selected "only these subsite" and the subsite created earlier.

I then created a new users under the subsite admin page and gave the user the subsite editor group

When logging in as this user they are logged into the main site admin pages and I can't switch to the subsite admin pages they have access to.