Delete User only remove User Id from User collection but not Firebase authentication

[Info Wedeck]

Hi

I used the Firebase Authentication Delete User in my app. I followed the configuration as per Flutterflow.io documentation on Delete User in this link 

https://docs.flutterflow.io/actions/actions/backend-database/firebase-authentication/delete-user

But what I have now is, upon user close the account, his user document is removed from and user collection and all others related document such as transaction etc.

But the user id still remain in Firebase authentication and the user can login again with the same credential, but all data are blank since the user documents and transaction documents are deleted. I have to manually delete the User id from the Firebase Authentication. 

I even install the Firebase Delete User Extension but the userid still cannot be deleted from the Firebase Authentication.