Minecraft 1.12 Pre-Release 5

Walking on blocks less than 1 block tall placed on ice, slime blocks or honey blocks acts like walking on ice, slime block or honey blocks directly

Cannot move backwards in Books while writing / Cannot copy anything from the book

Several mobs can pop off paintings, item frames and leads and destroy minecarts, armor stands and anything in item form even when mobGriefing is turned off

Snow layers don't drop themselves when harvested with a silk touch tool

All arrow types lose their name/NBT data when shot and picked up

Mobs going out of fenced areas/suffocate in blocks when loading chunks

Transparent blocks visually use the brighter light level that they are next to

No -breaking sound or- particle effect for some tools and all armor

Walking on non-solid blocks with no collision plays their respective walking sounds

Your experience level overflows once it exceeds the integer limit

Naturally generated light sources (fire, glowstone, torches etc.) sometimes do not emit light

Water, Cobwebs, Magma, Leaves and other blocks save sunlight

Mobs don't drop cooked meat if last damage is from fire, lava or fire charge

World turns completely black when having night vision, and being in the void or having blindness

Bonus chest doesn't always spawn on 'Snowy Kingdom' preset

Incomplete support of dead keys on non U.S. QWERTY Keyboard on OS X

Water/lava bucket can be used to destroy ladders

A Comparator can lock a Repeater, but the Repeater doesn't look like it is locked

Wrong rendering order of particles, hitboxes, clouds, transparent blocks, breaking animations and various other transparent textures

Initialization of OpenAL fails sometimes

Comparator in subtraction mode does not update visually under certain conditions

Various Particles glitchy movement

Wither skeletons and zombie pigmen won't go through lava to get to enemies, even though they can't burn

Villagers play the trade sound multiple times overlapping on shift-click

Extinguishing fire plays fizz.ogg twice

Walking on blocks less than 1 block tall placed on ice, slime blocks or honey blocks acts like walking on ice, slime block or honey blocks directly

Cannot move backwards in Books while writing / Cannot copy anything from the book

Several mobs can pop off paintings, item frames and leads and destroy minecarts, armor stands and anything in item form even when mobGriefing is turned off

Snow layers don't drop themselves when harvested with a silk touch tool

All arrow types lose their name/NBT data when shot and picked up

Mobs going out of fenced areas/suffocate in blocks when loading chunks

Transparent blocks visually use the brighter light level that they are next to

No -breaking sound or- particle effect for some tools and all armor

Walking on non-solid blocks with no collision plays their respective walking sounds

Your experience level overflows once it exceeds the integer limit

Naturally generated light sources (fire, glowstone, torches etc.) sometimes do not emit light

Water, Cobwebs, Magma, Leaves and other blocks save sunlight

Mobs don't drop cooked meat if last damage is from fire, lava or fire charge

World turns completely black when having night vision, and being in the void or having blindness

Bonus chest doesn't always spawn on 'Snowy Kingdom' preset

Incomplete support of dead keys on non U.S. QWERTY Keyboard on OS X

Water/lava bucket can be used to destroy ladders

A Comparator can lock a Repeater, but the Repeater doesn't look like it is locked

Wrong rendering order of particles, hitboxes, clouds, transparent blocks, breaking animations and various other transparent textures

Initialization of OpenAL fails sometimes

Comparator in subtraction mode does not update visually under certain conditions

Various Particles glitchy movement

Wither skeletons and zombie pigmen won't go through lava to get to enemies, even though they can't burn

Villagers play the trade sound multiple times overlapping on shift-click

Extinguishing fire plays fizz.ogg twice