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Raised event of InteractionRequest becomes null

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Hello,

We have a view that opens a UserControl (UC1) as a popup using InteractionRequest<INotification>.
     UC1ViewRequest.Raise(new UC1ViewModel
    {
        Title = "User Control 1"

    });
UC1 has a button that opens another UserControl (UC2) as a popup using InteractionRequest<INotification>.
     UC2ViewRequest.Raise(new UC2ViewModel
    {
        Title = "User Control 2"

    });
Opening UC2 again and again from UC1 works fine as long as UC1 is not closed.

But after closing UC1, UC2 cannot be shown/opened from UC1 but UC1 can be opened again from the main view.

The Raised event on the UC2ViewRequest is null.

Please advise. Attached is the sample to reproduce.

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