How to upgrade an anonymous user with the Register Screen

[clotodex]

I thought this #10071 would have fixed / supported this.
So after a user signs in anonymously, I open a register screen to let the user register.
However the user is never logged in and stays anonymous - the registered account is created though in firebase, however not linked.
What am I doing wrong? Did I miss something?

[clotodex]

I used authStateChanges, which does not update on user credentials linked. Should have used userChanges.
Also I listened in the RegisterScreen on the SignIn action and now changed it to CrecedentialsLinked.
Now everything works as far as I can see.