Is updateUIViewController always called immediately after makeUIViewController?

I'm in the unenviable position of needing the current UIViewController to keep an external library happy. Essentially, I need to do this in SwiftUI:

import LibraryOutOfMyControl

ViewControllerReader { viewController in
    Button("Action") {
        LibraryOutOfMyControl.action(with: viewController)
    }
}

My simple attempt below functions correctly but I'm relying on makeUIViewController always being immediately followed by updateUIViewController. Is the a reasonable assumption or should I set everything up assuming updateUIViewController might never be called?

struct ViewControllerReader<Content>: UIViewControllerRepresentable where Content: View {
    @ViewBuilder var content: (UIViewController) -> Content

    func makeUIViewController(context: Context) -> UIHostingController<Content> {
        UIHostingController(rootView: content(UIViewController()))
    }

    func updateUIViewController(_ uiViewController: UIHostingController<Content>, context: Context) {
        uiViewController.rootView = content(uiViewController)
        uiViewController.view.isUserInteractionEnabled = context.environment.isEnabled
    }

    func sizeThatFits(_ proposal: ProposedViewSize, uiViewController: UIHostingController<Content>, context: Context) -> CGSize? {
        uiViewController.sizeThatFits(in: proposal.replacingUnspecifiedDimensions())
    }
}