When trying to riding the Ender Dragon in spectator mode, you don't ride the Ender Dragon, but when the Ender Dragon leaves, the chunks around the Ender Dragon start degenerating, and when you press "Shift" you get teleported to the Ender Dragon.

What I expected to happen:

When I clicked on the Ender Dragon in spectator mode I would ride the Ender Dragon.

What happened:

When I clicked on the Ender Dragon in spectator mode, I didn't ride the dragon, and the chunks around the dragon started degenerating, and when I pressed "Shift" I got teleported to the dragon.