First one I tried - Napa Marriott - 10/18-19. Cash rooms, no awards.

Note that if you click "Use Rewards Points", the cash rate won't show up. In fact, nothing about the property will show up at all. You need to unselect and Update. For these dates, I get "Choose from 51 hotels across 10 brands in Napa" and "Choose from 33 hotels across 7 brands in Napa", so there seem to be 18 properties without award availability.

I prefer SPG's approach that shows them all, with a "Not Available" note next to each rate that's not available.