When creating a new Superflat world, I noticed that Superflat Customization has been untouched. With IDs no longer working at the topmost layer of commands (Only in NBT at the moment), it is more than logical to point out this oversight. Superflat Customization requires compatibility with the new system of block names.
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is duplicated by 2
relates to 1
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Due to Searge's tweet (https://twitter.com/SeargeDP/status/434779696291516416), this has been fixed and can be marked as such.