Stone pressure plates next to diagonal rails are not activated by minecarts

According to the wiki, stone and wooden pressure plates should be activated by minecarts on "diagonal" (which I assume means slanted) rails adjacent to them. Wooden pressure plates should always be activated, stone pressure plates should be activated if the minecart contains a mob or player.

This does not happen. Neither stone nor wooden pressure plates are activated by a passing minecart, with or without a player in it. I tried it with ordinary rails and powered rails.

Steps to reproduce:
1. Build the rig shown in the "Pressure plates" attachment.
2. Get in the minecart and press the button.
3. Listen for the pressure plate sounds and/or observe the redstone lamps as you pass. Notice that they are not activated.

What I expected to happen:
I expected to hear the sounds of at least one of the pressure plates being pressed and released, and to see the redstone lamps turning on briefly as I passed.

What actually happened:
No sounds were heard and the lamps remained dark.

This was based on a mistaken assumption that "diagonal" rail meant a slanted one. Please close, as it works as intended.