Observers incorrectly detect block updates of wall blocks

Observers detect updates of wall blocks when they shouldn't.

 

Steps to Reproduce:

Have a column of observers facing a column of wall blocks. These wall blocks should have their 'up' states be false (no central pillar). Using a sticky_piston, move another wall block from above this column (this additional wall block should initially have its 'up' state be false). The bug occurs on the retraction of the sticky_piston.

 

Observed Results:

On retraction of the sticky_piston all the observers will detect an update even though all walls (except for the top most wall that doesn't move) haven't had a change too their states.

 

Expected Results:

Observers would only detect an update to a wall block if their has been a change to its state/s. Meaning conducting the above action wouldn't trigger an update in all wall blocks.

 

In the video and screenshots attached below, it is expected that an update/s would occur only in the green_wool/deepslat_brick_wall section, not in the blue_wool/stone_brick_wall section.