It works for me. I don't know why it doesn't work for you.
The first screen image shows what I tested. It checks an enum column for "def". If that exists then it checks my Genre column for various things, only one of which is ever there (comics). I see the icon only on books that match, as you can see in the screen capture. The text shown with the icon is a version of the template that returns the name of the PNG you are using.
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