I don't use Enlgish, so I might have grammer correction.

So when I use ride command to display entities like block_display, item_display, text_display, it said that I rode to entity but I am sitting on nothing. You can only turn your camera only upside down. Your arm vibrate while riding. Also, you can't get out of it even when you press unride key. You can get out of it by using ride dismount command.

My arms

Riding that stone block display.