Classic Customized World Generation

Customizable World — 1.2.0-alpha.3

• Added Customized (Modern), a separate world type supporting modern terrain, caves, biomes, aquifers and normal Forge world-generation additions.
• Improved preservation of generation settings supplied by other mods and datapacks.
• Added Floating Islands and Caverns presets using Minecraft 1.20.1’s corresponding generators.
• Added SortaFlat (inspired) for gently rolling terrain with biomes, caves and structures.
• Expanded classic preset imports to support zero biome height weights, biome size 0, and river sizes 0–9.
• Added pagination to both preset menus for smaller windows and larger GUI scales.
• Improved switching between Classic and Modern customization and restoring settings through Re-Create.
• Limited sea-level sliders to each world shape’s generated height.
• Added validation to reject unsupported custom cave and terrain-height modifications safely.