Having the same issue with iOS 14.8.1 and 16.0.2. The previous releases still work but the ones that we uploaded to TestFlight are not working.

Went through the whole thread but didn't see any solutions to this. Our app displays a VC which has a WKWebView in it. It's still working and displaying the same content without a problem but that warning is a bit annoying and I'm not sure if it will cause issues on other iOS devices or not

Same issue here. Was able to upload it a few days ago 😅 TMS-90338: Non-public API usage - The app references non-public selectors in X-XXXXX-iOS: __swift_objectForKeyedSubscript:, __swift_setObject:forKeyedSubscript:, callWithArguments:, createRequest, frameInfo, identityToken, initWithFrame:configuration:, isMainFrame, setNavigationDelegate:, setProcessPool:, setRequestedScopes:, toDouble, toString, userContentController. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. For further information, visit the Technical Support Information at http://developer.apple.com/support/technical/