Thanks for the reply.
The "reserve" is not checked. As I said it works properly without XVM installed.
As a test, without XVM, I set the "reserve" filter, then changed it to a Primary.
Then I reinstalled XVM.
Now the T28 HTC will not at all show even if I have all filters off and search for it, unless XVM is not installed.
I uninstalled everything and deleted my settings as well.
After reinstalling, I can now see the T28 again, but the prior behavior remains. With XVM, neither the T28 HTC Concept nor Super Hellcat are displayed when the Premium filter is on.
Without XVM, it works as expected.