Please fix it when you die in superflat, you get sent to a different spawn. I always get super annoyed when I die by entering the void or something and I lose a ton of complex redstone, and I have to start all over.
Or you shouldn't fail so hard by dying in a superflat creative world!!! Come on, fly! Double tap space!
It has only happened a couple times, but that doesn't mean it shouldn't be fixed. I was making a video showing off a trap/security system/Bravery bridge (Search it) that took me forever to build that lead into the void, so I just let myself die. I forgot about the glitch, and now EVERYTHING is gone. Time. Wasted.
Also, sometimes I'll play in survival with TMI so I can't fly