Ender Dragon has no HP bar

Ender dragons spawned from commands have no HP bar. This doesn't make sense if it's intentional, since crystal-spawned dragons display bars correctly. Command-spawned withers also have HP bars, which shows that this is because only one non-command-spawned dragon can exist.

It's still annoying, though.

This actually affects all Minecraft releases, and I can't believe no one brought it up.