Sincerelyuq's Overhaul V2.1

Six new structures, a rebuilt Nether, and support all the way back to 1.21.6 — as a data pack or as a single mod jar for Fabric, Forge and NeoForge.

New structures

Six additions bring the pack to 33 structures.

• Amethyst Lake — a calcite and smooth basalt basin lined with budding amethyst and clusters, embedded in the stone of Dripstone Caves, Lush Caves and the Deep Dark.
• Lush Caves Plains — a moss and clay pond with azaleas, dripleaf and a spore blossom, generating on the surface across jungles, swamps, plains, meadows and forests.
• Pumpkin Seeds 1 and 2 — abandoned crop plots with a carved pumpkin and a jack o'lantern, placed like the existing Seeds structures.
• And 2 secret...

New loot

• desert_brush — archaeology loot for suspicious sand: gold nuggets, bones, bricks, all six desert pottery sherds, and rare diamonds.

Fixes

• happy_ghast_saving and last_nether never generated. Both had an inverted height range, and both were anchored to the world surface heightmap — which in the Nether is the bedrock ceiling. last_nether now sits at Y 8–22, the ancient debris band; happy_ghast_saving at Y 34–62, in the main cavern layer.
• The desert chests were empty. Their loot table id pointed one folder too deep.
• Suspicious sand dropped nothing. All 11 blocks across the two desert structures now carry a loot table.
• Desert Chest TNT punched a 10×13×11 hole into the desert. It was saved with solid air where it should have used structure void. Only the 26 blocks of the inner trap chamber stay air now.
• spruce_well lost its chains on older versions. chain was renamed to iron_chain in 1.21.9, so the structure now ships under the older id and lets the game's data fixer rename it upward.
• pack.mcmeta declared the wrong version range and still carried supported_formats, a field removed in 1.21.9.

Compatibility

The pack now runs on 1.21.6 and up, including 26.2 and the 26.3 snapshots.

Content that depends on newer versions degrades instead of breaking:

• Structures that list Sulfur Caves use optional biome tag entries, so the biome is skipped where it does not exist. sulfur_exp therefore does not generate below 26.2 — a sulfur cave structure without sulfur caves is not worth spawning.
• The badlands hot springs are built almost entirely from sulfur and cinnabar. They are gated behind a pack overlay and generate on 26.2 and later only.
• Golden Dandelion loot uses an optional item tag, so the village loot tables load cleanly on 1.21.6.

Mod version

sincerelyuqs-overhaul-2.1.0-1.21.6-26.2.jar covers Fabric, Forge and NeoForge from one file. Drop it into mods and the pack is active in every world — no need to enable it on the world creation screen. Fabric API is required on Fabric.

The data pack zip still works the usual way: drag it into More → Data Packs when creating a world, or copy it into saves/<world>/datapacks.