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Android - Initial URL opens in App Browser instead of internal WebView

Android build always opens the initial URL with an App Browser/Custom Tab toolbar (close button, domain, share and menu).

initialUrl is configured correctly and the compiled APK's appConfig.json contains the expected URL.

The matching link rule is mode: "internal".

I reproduced the issue using a completely static Firebase Hosting test page containing no JavaScript, authentication, redirects or links. The toolbar still appears.

The test URL returns HTTP 200 directly.

Could you check why the Android build is displaying the initial internal URL using the App Browser UI instead of the main WebView?

App public key: zpkedoz Android package: co.median.android.zpkedoz