Pale hanging moss is all destroyed at the same time when its supporting block is removed

The Bug:

Pale hanging moss is all destroyed at the same time when its supporting block is removed.

Steps to Reproduce:

1. Place a block in the air.
2. Place multiple pale hanging moss below the block.
3. Destroy the supporting block and take note of how fast the pale hanging moss is destroyed.

Observed Behavior:

Pale hanging moss is all destroyed at the same time.

Expected Behavior:

Pale hanging moss would all destroyed gradually following the behavior of similar blocks such as sugar cane or bamboo.