Tuning a note block with a block on top emits particle and sound

When tuning a note block with a block on top in 1.12.2, it doesn't play any sound or emit a particle as expected. However, when tuning a note block in 17w47b (and possibly earlier snapshots), it does play a sound and emit a particle regardless of whether there's a block on top or not. It should only do this when there's air directly above the note block based on the prior behavior.