the ender dragon flies through solid blocks such as obsidian.

the ender dragon flies and hovers through and in the obsidian pillars.

What I expected to happen was...:
that the dragon would not be able to fly through solid blocks.

What actually happened was...:
that the dragon flew right through the pillars!

Steps to Reproduce:
1.go to the end
2. wait until the ender dragon flies through an obsidian pillar.