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Pigs constantly jumping, when player control them on half slabs and stairs.

Slab and stairs lighting incorrect

Tree leaves break half slabs

Falling Through Half-Slabs

Zombies and Skeletons don't burn on slabs

Upper slabs with water/lava on top makes midair dripping water/lava

Sprinting up slabs with a speed effect makes you stop sprinting

Placing cake on wood slabs

Bugged torch hitbox on slabs

Sneak fails when placing slab on slab

Snow doesn't form / cannot be placed on upside down slabs / stairs

When block picking stone bricks (ID 43:5) I am given what appears to be stone bricks (ID 43:5) but when placed a double stone slab appears (Item ID 44 i think)

Items and stairs buggy collision

Pick Blocking on Double Cobblestone slab, when placed has stone double slab texture.

Half-Slabs allow Redstone Connections

Placing seamless double slab results in normal double slab

Seamless slabs will convert to nether bricks, breaking builds and maps

when slab over you and swimming upwards in water, you can see everything clear in the ocean

Riding a pig over a halfslab or stairs causes it to jump uncontrollably

slab lighting problem

Quartz slabs and double slabs using wrong texture

Wood Slabs floating

Mining a upside placed slab gives you the up placing slab with red background.

No quartz slabs

Torches cannot be placed on upside down slabs

Falling sand / gravel disappears when falling on most "half" blocks

gravel and sand when dropped onto slabs do not drop items correspondingly

Blocks that must be supported by other blocks, such as torches, doors, and levers, have strange behavior on certain blocks

Door breaks when placed on top slab or stairs