To reproduce the steps:
1) Pick the suspicious sand from your creative inventory
2) Place the suspicious sand
3) Break and place it multiple times
The bug here, is the sound switches from sandstone break sound to a glass break sound randomly
MC-260067
Glass break sound plays when breaking suspicious sand
Resolved
Works As Intended
1
This is most likely intentional, as the sound is usually meant to signify what types of loot could be in it