Dripleaf and buildheight will let you fly in survival mode

I was flying around in my survival world (with elytra) trying to land on a dripleaf wich went up to build height and somehow managed to start flying (like in creative). after I logged out and back in I was no longer able to fly and could not reproduce the bug.

Link to an unlisted video on me finding the bug (so you can see exactly how it happened and because it is hard to show in the photo form)
https://youtu.be/Ja_FygJ5ltI