Attempting to create a new superflat world, clicking "Customize", and then selecting "The Void" preset causes the game to crash when clicking "Use Preset"
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is duplicated by 8
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The game crashes when less than three block IDs are specified. The game crashed when I removed the bedrock layer of the classic flat preset, and explicitly adding 2 additional separate layers of air to the void preset loaded fine.
Upon further testing, the layer preview does not update its layer type count past what it has already displayed previously. Adding additional layers cuts off layers below in the preview, but they are still present in the preset box when you go to edit again. If you click recreate on a superflat world that has more layer types, it shows all properly but cuts off at the bottom when adding more layer types, still showing only the initial number of layer types. Removing one layer type from the recreated superflat crashes as well as that is less than what the preview shows, since the preview cannot display a layer that does not exist.
Can confirm