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Better underwater controls: get rid of auto-rising.

Under water night vision

Can see the water lighter in a certain position

grass grows under water

Flying after double tap forward underwater

Holding left click no longer works.

All blocks have a static like texture on the bottom when placed underwater

Spawning underwater / In the middle of an (lava) ocean

Minecarts and Primed TNT can be set on fire but cannot be extinguished by water

Player Loses Sync With Server After Trying To Mount A Horse In Water

entering ghost mode with horse

Boats toss you off like horses

Tools are slow while on horses or donkeys

Bonus chest spawns underwater leaving items underwater - no chest

Water in Marsh Biomes not updating

Graphical Underwater Glitch 13w41a

Drowning bubbles in Creative mode?

Boat sinking into solid block on low altitudes.

There are no particles and we can't see the sun and clouds under water.

Being under a water pool, without any contact with the water, adds to the vision the underwater effect

(Marker) Armor stands create bubbles in water

You can get drowned by Doors and Other Transparent Blocks (Still affects lava)

When a mob is hurt or killed while underwater there is no sound

Swimming up with parrot on shoulder makes the parrot invisible

Can't see rails through glass underwater

Block selection not showing up underwater

The player keeps its 1 block height of swimming animation when going out of water

Players get pushed by solid blocks above them in swimming mode

Smooth Lightning doesn't works well underwater

Random sugar cane underwater