Running FCM on IP stops Angular rendering

I need to sometimes run my app on IP for mobile testing etc, and this used to work fine in Angular 16 since firebase would just ignore IPs but now, since Angular 20, I get:

TypeError: Cannot read properties of undefined (reading 'addEventListener')

eventually failing with

FirebaseError: Messaging: This browser doesn't support the API's required to use the Firebase SDK. (messaging/unsupported-browser).

But not before it halts the whole app and stops it rendering.

This should just not do anything when it detect a none 127.0.0.1 IP as it did before, seems like there has been a regression bug somewhere.

Specifically the issue provider is:

provideMessaging(() => getMessaging()),

provideMessaging(() => getMessaging()) のエントリポイントから開始し、127.0.0.1 ではない IP でアプリを提供しながら問題を再現します。unsupported-browser error につながる初期化の失敗を追跡します。完了条件は、その環境で Firebase Messaging によってアプリのレンダリングが停止されず、継続することです。

索引モデルが issue の本文から書いたものです。