I created a superflat world using this code thing:
2;20,250x0,78:3;8;stronghold(count=7),biome_1,village(distance=0 size=0),decoration,dungeon,mineshaft
and the seed was
-7168682749803914668
I used creative. When I spawned, I flew up to the top of the world, when it ran out of memory. I reloaded minecraft and block one of the blocks. I crashed. When I loaded it back up, it looked like [pic attached], a line. There was a beginning point but it disapeared now. The block i broke was the beginning point. Up there it is laggy. I keep running out of memory up there.
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The same issue as creating a world of one layer fire. The recursive block updates will eat up the ram. You need at least one solid block as topmost layer.

Mojang should prevent the world from generating if the top block is non opaque.

what is the code for adding a layer of fire on a world?

by code I mean preset code