Thank you for posting this work-around. I tried it in my app to support opening while offline, but I still get the WebPageProxy::didFailProvisionalLoadForFrame error. I wonder if there is something else that must be configured in order for it to work fully offline.

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Crickets. Inquiring minds want to know...

This issue is blocking usage of our app. Apple sign in no longer works in WKWebView under iOS 17, even though it is possible to sign into the website via Apple login on the same device.

Fixed in iOS 17.2.