Flying into an end portal from the overworld in creative can often result in a glitch in the end world where the player is stuck in a void end world with only the sky, glitching between y 48 and 49 where the obsidian platform would have been.

This may take more than one attempt. May also occur when not flying and walking/shifting/sprinting/jumping into the portal at angles (not sure exactly how/what angle/where it occurs then)

The only way to return is to kill yourself and respawn or exit the world and reenter.