Prevent firebase automatic Signin after creating a new user

I was working on a project which has an admin side, an admin could add another admins, and when an admin A add an admin B it automatically signin the admin B, so after many researches I found that firebase doesn't provide any way to prevent or disable this behavior.

So I wanted to find the best solutions for a perfect user interaction, as we say features comes to fix bugs, So here is my alternative solution to hide this 'bug' :

1. Before everything, we want to save our current admin's email in a state.
2. When we click the submit button, we create a new admin B like usual cases.
3. When admin B has been created successfully we open a dialog box and we ask admin A to confirm this action by providing his password (like a security check) on a password field inside the dialog box. 4.Now we have all credentials of admin A as shown in step 1 (email) and step 3 (password). 5.Now we can call signin method and sign the admin A back.
   Now let's write it in code (I'm using Rreact and @mui/material in my frontend) :

Frontend :

<TextField
  fullWidth
  label="Email"
  type="email"
  onChange={(email)=>{setEmail(email.target.value)}}
/>
<TextField
  fullWidth
  label="Password"
  type="password"
  onChange={(pass)=>{setPassword(email.target.value)}}
/>
<Button
 onClick={createNewAdmin}
/>
<Dialog open={showDialog}>
  <DialogContent>
    <DialogContentText>
      Tap  your password !
    </DialogContentText>
    <TextField
        label="Password"
        type="password"
        onClick={(pass)=>setReAuthPass(pass.target.value)}}
      />
  </DialogContent>
  <DialogActions>
   <Button onClick={signAdminBack}>
    Confirm
   </Button>
  </DialogActions>
</Dialog>

State :

const[email, setEmail] = React.useState('');
const[password, setPassword] = React.useState('');
const[oldEmail, setOldEmail] = React.useState('');
const[reAuthPass, setReAuthPass] = React.useState('');
const[showDialog, setDialog]=React.useState(false);

Functions :

const createNewAdmin=()=>{
   const auth = getAuth();
      //saving the current admin email
      setOldEmail(auth.currentUser.email);
      createUserWithEmailAndPassword(auth, email, password)
        .then((userCredential) => {
         //opening the dialog
         setDialog(true);
        }).catch((error)=>{console.log(error);});
}

const signAdminBack=()=>{
  const auth=getAuth();
  signInWithEmailAndPassword(auth, oldEmail, reAuthPass).then((userCredential)=>{
          //admin A brought back
          //closing the dialog
        }).catch((err)=>{
          console.log(err);
        });

}

Images