Noclip?

I logged into a world (Creative Mode, Singleplayer) and i slowly glided down(with Noclip?), and when i flew, i could Noclip, but couldn't interact with anything or chat/use commands(same as gliding) Marking as Private so people dont use it to cheat on servers (even though I have no idea how i did it)

Screen shot shows i could Freely fly through the blocks