docData observable stream emits identical object values multiple times in a row

### Version info

**Angular:** ^18.0.0

**Firebase:** ^10.13.0

**AngularFire:** ^18.0.1

**Other (e.g. Ionic/Cordova, Node, browser, operating system):**

"@ionic/angular": "^8.0.0",

Tested on MacOS Chrome, but reproducible elsewhere. Else let me know.

### How to reproduce these conditions

Simply press the update button after strating this project, it will update the game entity and make it emit twice:
https://github.com/folsze/firebase-observable-double-emission

here is a related stackoverflow post that I created:

https://stackoverflow.com/questions/78891192/firebase-docdata-stream-emits-identical-object-values-multiple-times-in-a-row

**Steps to set up and reproduce**

run with package json npm run

then simply press the update button, it will update the game entity and make it emit twice:

### Debug output

** Output from `firebase.database().enableLogging(true);` **
<- I have no idea what this is suppoed to do for me. I added this but receive no logs:

import { enableLogging } from '@angular/fire/database';

enableLogging(true);

### Expected behavior

It only emits once

### Actual behavior

it emits multiple times (twice currently for this simple scenario):

Start with the linked firebase-observable-double-emission reproduction project and its package scripts; run it and press the update button to observe the docData stream. Compare the repeated identical emissions with the expected single emission, using the provided Stack Overflow discussion and logging note for context.

Written by the indexing model from the issue text.