In the Obsidian Pinnacle, riding the pistons with Ghost Cloak and Boots of Swiftness will keep you stuck in the air.

I've attached a movie that shows the actual occurrence of the bug.

 P.S.
I have a new fact.

It was found that if ride a piston using Ghost Cloak and the invisibility is deactivated in the air, it stays in the air (or falls off).
This can occur not only in Obsidian Pinnacle, but also in camps.