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Double extending pistons act differently at different Y values. (As far as I can tell)

Command Blocks summon entities 1/2 a block too high when using relative coordinates

Monsters spawn at daytime at y=256 and don't burn

Double plants can be placed at and grow at y = 255 resulting in incomplete double plant

targeting with only y and dy doesn't work in command block

/setblock at Y=256 shows unique message compared to using other outside-world setblock commands / Using /setblock at Y>256 says max building height is 256

Particles are dark Y>=256

Water and lava tint and surface are both missing or appear both at certain y coordinates

2 × 2 jungle and spruce trees don't grow from the lowest layer

y coordinate based rendering offset not working

Lava tries to place fire at Y 256

Parrots dismount when y coordinate decreases

Teleport height limit is lower than summon height limit

Sky turns already dark when player is below y = 1

Double plants can be placed at and grow at y = 255 resulting in incomplete double plant

Oak trees can generate right below height limit (y = 256) resulting in incomplete tree

Dispenser with filled bucket at y = 255 facing upwards replaces filled with empty bucket despite no fluid being placed

Debug world spawns player at y=2 instead at y=70 where all the blocks are

Swimming gravity is artificially induced when there's no room to stand upright

In the debug world, the birth point is at Y=2 And after debugging kill in the world

Tp with relative y makes a floating glitch

being in water at y 0 makes screen too dark

Nether biomes do not have correct y level boundings