Two consecutive `subscribe` calls on the Observable created by `authState()` cause Angular app to never become stable.

[ddereszkiewicz]

Version info

Angular: 18.0.3

Firebase: 10.12.2

AngularFire: 18.0.1

How to reproduce these conditions

Failing test unit, Stackblitz demonstrating the problem

Stackblitz example with the problem: https://stackblitz.com/edit/stackblitz-starters-zfidzt?file=src%2Fmain.ts

Steps to set up and reproduce

• Open Stackblitz reproduction
• Check the console, and see that the ApplicationRef.isStable never emits true

Debug output

Errors in the JavaScript console

message: isStable: true is expected, but it never comes

Expected behavior

ApplicationRef.isStable emits true after application start.

Actual behavior

ApplicationRef.isStable never emits true, if two consecutive subscribe calls on the Observable created by authState() are made.