1.17:
Amethyst Geodes should generate in Middle Earth.
Vanilla Emeralds and Diamonds should generate in Middle Earth. Though Diamond weapons and armor would be disabled.
Vanilla Copper Ore should generate in Middle Earth.
Vanilla Rabbits should spawn in Middle Earth.
Bees should spawn in the Shire.
Dripstone Clusters should generate in Middle Earth alongside the mod’s Dripstones.
1.18:
The Deepslate layer should generate in Middle Earth since it is just another layer of Stone, only it is Slate.
Azalea Trees should generate in Jungles.
The Dripstone Caves should generate in Middle Earth.
Uncertain:
The Deep Dark and Wardens should generate and spawn in Middle Earth, representing the Nameless Things.