What package does this bug report belong to?

webview_flutter

What target platforms are you seeing this bug on?

Android

Have you already upgraded your packages?

Yes

Dependency versions

  webview_flutter_android:
    dependency: transitive
    description:
      name: webview_flutter_android
      sha256: "3e5f4e9d818086b0d01a66fb1ff9cc72ab0cc58c71980e3d3661c5685ea0efb0"
      url: "https://pub.dev"
    source: hosted
    version: "3.15.0"

Steps to reproduce

1. Add NavigationDeletage.onNavigationRequest to the Webview
2. Go to a site which has an iframe that executes data:text/html,<script>onresize=function(){parent.postMessage(0,'*')}<\/script>

Expected results

Iframe is allowed to load that content

Actual results

The main frame loads this content, causing a white page.