Ion-radio list behavior in iOS 12

I opened this example using a UIWebView app on my iOS 12 device.
https://ionicframework.com/docs/v1/api/directive/ionRadio/

The radio list selects the correct radio (Angular) and the following radios in the list on iOS 12. In this example, only Angular should be selected on the Clientside list.

Attached: screenshot from UIWebView

I have the same issue in ios 12. Does anyone have idea in how to fix it?

May I know if ionic v1 is not support anymore?