I'm also having this problem...

Same here. I even tried with a git reset head to make sure it was exactly the same version. I'm using the latest version of capacitor, nothing else. ITMS-90338: Non-public API usage - The app references non-public selectors in Frameworks/Capacitor.framework/Capacitor: applicationNameForUserAgent, initWithFrame:configuration:, isMainFrame, setNavigationDelegate:, targetFrame.