Gravity-affected blocks broken when falling into an invalid space do not make a sound or produce particles
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When something is sand is dropped onto a torch, the sand will break, but no particles are produced, as one would expect from a block breaking. Also note the lack of a "Block broken" in the subtitles, signifying that this also produces no sound.
This issue is not present with suspicious sand or suspicious gravel. This bug is also not present in the Bedrock Edition.
I do not have access to the Bedrock Edition of the game however I can confirm in 20w49a that no particles are produced when doing this.