I have a similar issue. I send the version 50 to the Testflight. I received an email with this notification. All Fine. But when the Testflight "install the build 50", really install the build 46. This make me sick !!

I have a similar issue :( ITMS-90338: Non-public API usage - The app references non-public selectors in INTERmx: authorizationCode, createRequest, determineAppInstallationAttributionWithCompletionHandler:, estimatedProgress, identityToken, initWithFrame:configuration:, initWithURL:configuration:, initWithURL:entersReaderIfAvailable:, isMainFrame, isPassthrough, lookupAdConversionDetails:, navigationType, onSuccess:, removeValuesForKeys:completion:, setNavigationDelegate:, setProcessPool:, setRequestedOperation:, setRequestedScopes:, transform:, userContentController, viewManager, websiteDataStore. 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/