[MC-201120] Superflat presets broken?

When i type custom preset code in the top it never saves when i click use preset

Comments 4

Is the preset valid?

i took it form the wiki minecraft:bedrock,2*minecraft:dirt,minecraft:grass_block;minecraft:plains;village,stronghold,mineshaft,dungeon

The Wiki is outdated, several things in this code are no longer supported with preset codes and are instead done by the new Custom World system.

how would i make a superflat world with all the normal gen like mineshafts strongholds pillager outpost and all that