Here is a trivial .idl file:

import "oaidl.idl";
import "ocidl.idl";

namespace MyNameSpace
{
    [default_interface]
    runtimeclass Dummy : Microsoft.UI.Xaml.Window
    {
        Dummy();
    };
}

When I try to compile just this file with VS2022 17.10.4, I get 2 MIDL2003 errors:

[msg]redefinition [context]: _FLAGGED_WORD_BLOB   wtypesbase.idl line 468
[msg]redefinition [context]: IUnknown             unknwnbase.idl line 42

Commenting out both of the imports eliminates the error, although commenting out either one does not. They are not necessary for this repro, but I need them in my real app. Suggestions?