Redirect to login looses instance url

When we are connected to an instance and the token is invalidated, we are correctly redirected to /INSTANCE_URL/login. But if we refresh the page here, we loose the /INSTANCE_URL part of the url and are redirected to the welcome page.

If we are not connected to an instance, entering the url in the form will redirect to /login and not /INSTANCE_URL/login. Just as before we are back to the welcome page.