first click on button doesn't work

hi there,
when i use onChange in first app run when user click on button:
navigate url : https://example.com/ ==> false
in other times : https://example.com/123456 ==> true

Start by reproducing the first-run button behavior described in the issue, including the onChange callback and the two example URLs. Inspect the flutter_webview_plugin entry points handling button navigation and determine what distinguishes the first click from later clicks; done means the first click produces the expected navigation result.

Written by the indexing model from the issue text.