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ComboBoxEvents - ValueChange Broken? Cascading ComboBox stopped functioning

I have a page that has a cascading ComboxBox that is actually pretty much the exact same as the example at https://blazor.syncfusion.com/demos/combobox/cascading for filtering country, state and city.  It was working but now is not.

Using the code, which is pretty much identical to the sample code the page is erroring out. If now states the following error when building:

Error CS1503	Argument 2: cannot convert from 'method group' to 'EventCallback'

I have tried both with and without the @ sign for the ValueChange="ChangeCountry" function. Same error either way.

<ComboBoxEvents TValue="string" TItem="Countries" ValueChange="ChangeCountry">

<ComboBoxEvents TValue="string" TItem="Countries" ValueChange="@ChangeCountry">

What changed/broke recently with ComboBoxes?  It is a really, really core piece of functionality that needs to work.  Has me a bit spooked that it just suddenly stopped working.  Thanks!