This only happens sometimes, this happened way before 1.16 (I think). So when you're running and sprint jumping on a grass block, it would make a stone sound, again it'll occur sometimes.
Step 1: Run and jump on some grassy field
Step 2: Make sure there are no stones nearby
Step 3: You'll hear it
Linked issues
is duplicated by 6
MCPE-162196
A cube that is not a stone makes a stone sound
Resolved
MCPE-171610
Jumping off or landing on the edge of any block produces stone sounds
Resolved
MCPE-174477
Sometimes when you fall on a grass block, the sound of stone will play
Resolved
MCPE-179367
Stone Sound Effects When On Edge of a Block
Resolved
MCPE-190599
Jumping or falling on the very edge of a block will always play the stone sound for it instead of the correct block sound
Resolved
1 more links
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