Compile Error: "The type or namespace name 'MauiUIApplicationDelegate' could not be found" in latest nightly builds

[MAUIoxo]

Since sometime last week, I get this compile error when I try to compile my .NET MAUI Project:

The type or namespace name 'MauiUIApplicationDelegate' could not be found (are you missing a using directive or an assembly reference?)

First of all, I thought one of the nightly builds did not get built correctly, but I still get this, e.g. when I use the build from tonight: <MauiVersion>8.0.7-nightly.9895</MauiVersion>. The Reference <MauiVersion>8.0.6-nightly.9880</MauiVersion> was still working.

Was there a breaking change or am I missing something now?

This also happens for these lines at the MauiPicker

protected override void ConnectHandler(MauiPicker platformView)
{
    base.ConnectHandler(platformView);


    var toolbar = (UIToolbar)platformView.InputAccessoryView;

    // Set custom text for the Done button
    var doneButtonText = new NSString(AppResources.DoneButtonText);
    DoneButton = new UIBarButtonItem(doneButtonText, UIBarButtonItemStyle.Done, (sender, e) =>
    {
        this.PlatformView.EndEditing(true);
    });

    // Add the button to the toolbar previously created
    toolbar.Items = new UIBarButtonItem[]
    {
        new UIBarButtonItem (UIBarButtonSystemItem.FlexibleSpace),
        DoneButton
    };

    this.PlatformView.InputAccessoryView = toolbar;
}```