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This may be resolved by first clearing the filters before applying a new filter set.
Though I'm noticing a difference in the 'field name' value that is used. For Clearing filters, it seems the field used is the user friendly name that shows up in the Layout window.
For applying filters, the field name that is used is the field name that appears in the 'edit filter...' dialog. This was a bit confusing at first.
I'll update this post if needed.