if you walk on a carpet the sound is not a wool sound (I guess how it's supposed to be) but the sound of the block below it
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why then can't they make them like snow? snow is also 1-2 pixel high and a hitbox and sound

This ticket has been marked as a duplicate of MC-16446, in favor of the better description/information provided.
I don't think this is a bug as carpets have no hitbox, meaning the game thinks the player is walking on the material below.
...but, it would be better if this is fixed as it would make the builds using carpets more realistic.