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MC-123791

Crash after customizing superflat world with a custom preset

The bug

After clicking "Use Preset" with a custom preset with an invalid character, it crashes.

What I expect to happen

A message will appear showing that the preset is invalid.

Steps to reproduce

Try to create a new superflat world with the preset minecraft:piston[facing=up];1;

:info: Note: This may be a duplicate of MC-122441, but it doesn't seem to be fixed.

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superflat-customization

Minecraft 18w01a

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