Can't use didFinishUpdateCycleForUpdateCheck

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Description of the problem

I am integrating our MacOS app with Sparkle and everything works properly. However, I now want to introduce a callback whenever the app is updated. I found out in the docs that I can do something like this:

class AppDelegate: SPUUpdaterDelegate {
    ...
    var updaterController: SPUStandardUpdaterController? = nil
    ...
    func applicationDidFinishLaunching(_ aNotification: Notification) {
            updaterController = SPUStandardUpdaterController(startingUpdater: true, updaterDelegate: self, userDriverDelegate: nil)
    ...
    }
    ...
    func updater(_ updater: SPUUpdater, didFinishUpdateCycleFor updateCheck: SPUUpdateCheck, error: Error?) {
        debugPrint("Update cycle finished")
    }
...
}

However, this callback is never executed. What am I doing wrong?

Do you use Sandboxing in your app?

No

Version of Sparkle.framework in the latest version of your app

2.1.0

Version of Sparkle.framework in the old version of app that your users have (or N/A)

2.1.0

Sparkle's output from Console.app

Steps to reproduce the behavior

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