Bone blocks have an unused "deprecated" block state when placed with commands. That state is not functional, and thus unneeded. Bone blocks placed by the player have the deprecated state set to 0 by default.

Steps to Reproduce:

1. Place down a bone block with the deprecated state of 1 with command: /setblock ~ ~ ~ bone_block["deprecated"=1]
2. Stand on top of the bone block with the deprecation state that was just placed with commands.
3. Use /testforblock ~ ~-1 ~ bone_block["deprecated"=1] to check the state.

Observed Results:

Bone blocks have an unused "deprecated" state. This block state has no uses for the bone block, and is not encountered in regular survival gameplay.

Expected Results:

The "deprecated" block state for bone blocks will be removed from the game, as this is a useless block state for the bone block.