Java Edition 18w10c

18w10c is the twenty-sixth snapshot released for 1.13.

General

 * New water physics
 * Water can be placed in chests, trapped chests, stairs, slabs, fences, walls, iron bars, and glass panes.
 * Water can flow out these blocks, but can not flow into them.
 * When full of water, they will count as water blocks for all gameplay (such as swimming).
 * Water will flow out of all faces of the block.
 * Removed the blocks  and.
 * Removed the block tags  and.
 * All of the blocks that water can be placed in now have the block state.
 * Blocks such as bubble column or kelp will always count as a water source.

Mobs

 * Phantoms are now considered undead mobs
 * This means that they are harmed by Healing potions, healed by Harming potions, ignored by the wither, and affected by Smite enchantment.