Yamaha receiver ignores "scene" commands

I have three Yamaha RX-series receivers (RX-V473 and RX-V573), and I control them in Roomie via the “2011+ Models Zone 1” setting.

Each receiver responds to all commands (or all those I’ve assigned) with the exception of the “scene” commands. When those are assigned in Roomie, the receivers simply ignore them. I’m forced, instead, to use the “Input HDMI” commands.

The same is true, whether used as a start command or whether selecting from the manual remote.

Is there a reason why “scene” commands aren’t responding?