JS event listeners infinitely incrementing in batches of 2.

Version info

Angular: 10.0

Firebase: 7.13.1

AngularFire: 6.0.2

Verified on Chrome on macOS. Safari on iPhone heats up the device when loading the affected site.

How to reproduce these conditions

Steps to set up and reproduce

1. Create a new Angular project using the CLI
2. Add AngularFire using ng add @angular/fire
3. Add configuration and AngularFireAnalyticsModule

Please note that the problem may not be with AngularFireAnalyticsModule but it is enough to reproduce the error. I am getting this error on a project that uses MixPanel too.

StackBlitz: https://angular-fire-start-d8ivab.stackblitz.io/
Please open DevTools > Performance Monitor and note the "JS event listeners" count increase

Editable StackBlitz: https://stackblitz.com/edit/angular-fire-start-d8ivab?file=app%2Fapp.module.ts

Expected behaviour

The JS event listeners should be static after a certain point. (Or should be cleaned up regularly).