Shadowlands

3.9 Changelog:

Added Creeper Cave Vines, with fruiting variants which drop Rambutan fruit
Added Creeper Bulbs, which grow down from the cave ceiling and when mined will sometimes explode, spawn a creeper, or uncommonly drop a creepoid chunk
Added boss statues, with stone and gold variants
Gave Disgruntled Shrooms and their variants a custom model, rather than using the creeper model
Fixed Cosmic Flowers not spawning (they aren't useful yet though so it's been low priority to fix)
Fixed Greenwort not spawning
Improved several block textures
Made the Plaguemaiden boss 25% larger
Made Abyssal Eyes drop cooked meat if on fire when killed and made the meat drops affected by looting
Put Abyssal Steak recipes in the correct recipe book section
Added Decipedes (a new hostile mob) to the Shadow Forest dimension
Added Raw Decipede Meat and Decipede Steak
Slightly reduced spawning group sizes in the Shadow Forest dimension
Shadowlands mushrooms and White Crystals can now be placed on any solid and non-transparent block, rather than just plant sustaining blocks, and can no longer be used in Suspicious Stew
Changed White Crystal sounds
Rare mushrooms now have a tooltip saying they are rare
Made Huge Mushroom Top blocks have a more reasonably sized inventory model
Fixed map colours being mostly wrong
Fixed the Demon Axe actually being a pickaxe
Changed Solid Cloud block strength from 1 to 0.5

1.20.4+ port of these changes will happen eventually although it's not that high of a priority at the moment since 1.20.1 is far more popular currently.