The bug
When flattening a grass block into a path immediately after the grass block grows from dirt, the shovel sound doesn't play.
How to reproduce
Place many dirt blocks on the ground
Set the random tick speed to 100
Hold right-click while targeting a dirt block with the shovel
Wait until the grass grows
→ ❌ Listen up and notice the sound will not play
This is no longer possible to reproduce since 20w45a, because you can make it from dirt, not just grass,