Dead Bush Farming
Bone meal can be used on sand to generate dead bushes.
Cobwebs
Cave spiders can make cobwebs.
Deepslate Generators
In the deep dark, the rules for stone and cobblestone generation produce deepslate and cobbled deepslate respectively instead.
Tuff Generator
Lava flowing next to blue ice and on top of soul sand produces tuff.
Calcite Crafting
Calcite can be crafted from cobblestone and nautilus shells.
Sand Smelting
Dirt can be smelted into sand.
Wandering Trader and Spore Blossoms
Wandering traders can sell spore blossoms.
Elder Guardian Lightning
A guardian struck by lightning turns into an elder guardian.
Heart of the Sea
An elder guardian killed by magic (such as a conduit) drops a heart of the sea.
Suspicious Sniffing
Sniffers can sniff out extra suspicious sand and gravel in structures that contain archaeology.
Sniffer Treasure
Sniffers can sniff and dig up extra chest loot from various structures.
Enderman Surface Block
Endermen spawning on the surface can spawn with a surface block depending on biome.
Enderman Underground
Endermen spawning underground in the overworld can spawn with various blocks you find while mining.
Enderman in the Depths
Endermen spawning deep in the overworld can even spawn with deepslate.
Enderman in the Nether
Endermen spawning in the nether can spawn with various nether blocks.
Enderman in the End
Endermen spawning in the end can spawn with end stone.
Decapitated Dragon
Kill the ender dragon by a charged creeper and it will drop its head.