Apple solved the issue, thanks.

Same here, an app that has been releasing updates without issues for months. Even 2 days ago, a testflight version successfully uploaded, but today it just failed after simple (non native) changes. TMS-90338: Non-public API usage - The app references non-public selectors in zinspector3: estimatedProgress, initWithFrame:configuration:, isMainFrame, isPassthrough, navigationType, onSuccess:, removeValuesForKeys:completion:, setNavigationDelegate:, setProcessPool:, targetFrame, userContentController, websiteDataStore. Did apple turn on a setting that bans all these out of the blue? Or did someone add a "not" condition in their code and now everything is flagged?

Any updates? 15.2 is near and this is still broken.

Any updates? Canvas in WKWebView are unusable.

How can we fix this from code in WKWebKit?