I loaded a creative world with cheats, and one of the first things I see is a giant square made of oak leaves. Also I tried to go into Spectator mode to see if there was anything was in the leaves but I couldn't. I don't know if this a bug/glitch but I saw it so yeah. the first screenshot is the leaves. The second is the command problem
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Seed-6240731511992781778

Couldn't confirm for MC 1.13-pre2
I tried to reproduce it, but I couldn't. This error is not very common. It's a punctual generation bug.

o ok what about the command?

Please only report one issue per ticket, also use the search function before reporting an issue. See: Guide: Writing Helpful Bug Reports for Minecraft

The command is working for me too.
Write "/gamemode", press "tab" and choose the gamemode you want.
If that does not work try restarting your game.

Most likely the world was created with 'Allow Cheats: Off'

Probably but he said he created a world WITH cheats. 😛
Dupe of MC-125807

Mods, this is a duplicate.

It would appear as a duplicate.