SkyChunk: SkyBlock + ChunkSurvival (Java 1.20.6)

We all know SkyBlock and Chunk Survival, but why not combine them together?
Introducing SkyChunk: SkyBlock in One Chunk!
The world is surrounded by barrier block and world border, and if you really get out of the border, you will die instantly.
What will this world become? It depends on you.

Dimension	Overworld	The Nether	The End
Minimum Y Coordinate	-64	0	0
Maximum Y Coordinate	320	256	256
Biome	Plains	Nether Waste	The End
Block Resources	Bedrock Grass Block Dirt Oak Log Oak Leaves Chest Sand Sandstone Water Bamboo Sugar Cane Cactus Moss Block	Bedrock Netherrack Shroomlight Crimson Nylium Crimson Stem Nether Wart Block Warped Nylium Warped Stem Warped Wart Block Obsidian Nether Portal Crying Obsidian End Portal Frame Barrel	Bedrock Dragon Egg End Portal Torch
Item Resources	Pointed Dripstone * 5 Melon Seeds * 1 Pumpkin Seeds * 1 Ice * 1 Lava Bucket * 1	Ender Eye * 12	-

By the way, the size of this world's zip file is only 25859 Bytes (~25.25KB) !
WARNING: impossible to get all blocks/items/mobs/advancements without cheating, so don't set your goal to that
Anyways, have fun!