Bubble spore

WIP A bubble spore is a non-solid plant block that generates in oceans.

=Obtaining=

Breaking
Seagrass can be harvested only with shears. Using any other tool, item, or the player's fist destroys seagrass and causes it to drop nothing. When harvested with shears, regular seagrass drops itself as an item, and tall seagrass drops 2 seagrass items.

Natural Generation
Seagrass generates in either its tall or small form in ocean biomes near kelp, and also generates by itself in rivers, underwater caves and swamps, replacing ice[1] and planks[2] as necessary. Seagrass sometimes can naturally generate on gravel.

Growing
Using bone meal on a non-transparent block‌ that is underwater generates a bubble spore on that block and its surrounding blocks. In order for this to work, there must be 2 water blocks above the block the bone meal is being used on, and the lower one must be non-flowing water.

Mob loot

 * Thala-sirens: A thala-siren drops 0–2 bubble spore when killed.

=Usage= WIP Bubble spore seeds can be placed only on non-transparent blocks. Placing blocks inside a bubble spore deletes the bubble spore.