Chests can't be destroyed in creative mode if you have a sword in your hand.
What I expected to happen was...:
The Chest to be destroyed.
What actually happened was...:
The Chest started doing the breaking block particles
Steps to Reproduce:
1.Go to creative mode.
2.Place a chest.
3.Get a sword.
4.Put the sword in your hand.
5.Try to destroy the chest.
You just did the glitch.
This isn't a bug, and it's not just chests. They intentionally made it so that you can't break anything with a sword in creative. Makes fighting unwanted mobs easier.