Flutter_webview_plugin calls OnURLChange two times every time URL changes

I have some functionality on URL change (I'm opening external links in the browser instead of webview) but it opens the browser 2 times and when I checked it using STOP POINT the reason is it calls function 2 times every time URL gets change.
I'm using flutter_web_browser for opening up links in chrome.

Start by reproducing a URL change with the Flutter WebView plugin and trace the OnURLChange callback, especially when opening an external link with flutter_web_browser. Done means each URL change invokes the callback once, so the external browser opens only once.

Written by the indexing model from the issue text.