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.
MC-122313
Tuning a note block with a block on top emits particle and sound
Resolved
Fixed
3
Strange thing happened with his bug.
I was testing a noteblock with a block on top the other day in 17w47a, no sound was played.
I loaded the same world in 17w47b, before seeing this report, and tested it again: Plays no sound.
Looking through the bugs I see this report and try it again: Plays no sound.
I place a new noteblock nearby, put a block on top: Plays sound.