I was having the same problem for last half year, as I thought Apple will fix it before my app publication. However, it didn't happen and I had to find some way to make it working. Appears it's ease to fix with one line of code in SceneDelegate. The solution isn't perfect, as it overwrites all UIAlertController tintColor, but it works.
// SceneDelegate.swift
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// ...
UIView.appearance(whenContainedInInstancesOf: [UIAlertController.self]).tintColor = UIColor(named: "AccentColor")
// ...
}
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In my case it was caused by missing files (missing files was red on list in xcode's file explorer).