Overlays
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1.21.11: Pre-Tiny Takeover / Pre-Transparency Changes
- retains loose assets/minecraft/textures/entity files
- retains partial transparency leaves


1.21.10 Pre-Mounts of Mayhem / Pre-Model Multi-Axis Rotation Freedom
- retains loose celestials & pre-sliced moon_phases.png


1.21.8 Pre-The Copper Age
- retains chain.png 


1.21.6
- empty


1.21.5 Pre-Model 22.5 degrees Rotation Freedom
- provides legacy jade mod support
- provides legacy signal campfire models


1.21.4: Pre-Spring to Life
- retains legacy cows, pigs, sheep, and chickens
- retains legacy pig & strider saddle
- provides spawn egg backport model


1.21.3: Pre-The Garden Awakens
- torchflower model
- shield model
- retains legacy magmacube
- brewing stand UI
- horse slot UI
- loom slot UI
- retains achievment Ui system.png
- retains broken_elytra.png
- retains empty slots in assets/minecraft/textures/item


1.21.1 Pre-Bundles of Bravery
- retains loose player armor, armor trims, horse armor, wolf armor, elytra, & llama decor
- provides spawn egg backport model
- provides bundle backport textures


1.20.6 Pre-Tricky Trials
- retains legacy bad omen effect


1.20.4 Pre-Armored Paws
- retains pre-sliced map_icons.png
- retains scute.png
- retains legacy fabric mod creative_buttons.png


1.20.2 Pre-Bats and Pots
- overrides the grass blockstate to use multiple weighted model variants (block/foliage/grass/* plus low_grass).
- retains legacy grass block texture at assets/minecraft/textures/block/grass.png.
- retains legacy bat texture at assets/minecraft/textures/entity/bat.png.
- provides bat backport texture and model through CEM