I receive the same error back in the func webView(_ webView: WKWebView, didFailProvisionalNavigation: WKNavigation!, withError error: Error). The error received is WebKitErrorDomain code 102 - Frame Load Interrupted.
PDFs, JPGs all display fine in the WKWebview on M1, but unable to display Pages, Numbers and other Microsoft file types without the above error.
The same files that fail with error on M1 display without a problem on the iPad.
Any help in identifying why M1 fails for these file types would be appreciated.