can not load http data when i return a instance from other instance?

follow me:
I customized the Webview component to use new WebviewScaffold(); When I call to render another instance in it again, and then return; unable to get HTTP data.

for example:
1) webview A -> webview B
2) webview B -> webview A
3) can not load data in webview A;

## System info

Android version 9
flutter_webview_plugin: ^0.3.11