Can you set your device's language to English and share another picture of the webview selection screen? I'm not sure what the errors there say and Google Translate isn't doing a good job.
I think the issue is that you have multiple users on your device (possibly created by some "MultiApp" feature provided by the phone manufacturer?) and the beta webview is not installed for the "multiapp" user. The normal non-beta WebView seems like it might be uninstalled/disabled for the main user on the device?
For a WebView package to be usable it has to be installed and enabled for every user that exists on the device.