When jumping while moving forwards on carpet you hear the wool/carpet walking sound (maybe not bug but also when placed and walked on carpet has the sound of the block the carpet is placed on)

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Confirmed.
Walking / running on snow layer gives not the sound of the unterlying block.

Clarification:

• When walking on snow / carpet, the player walks still on the underlying block (the y coordinate does not increase). When walking on snow, the sound of the underlying block is surpressed, when walking on carpet not.

• When jumping, the player is in the the coordinate of the carpet block
  Both effects visible at the sprinting particles.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Note: this is a automatic message, so apologies if I miss something.

This is still noticeable in 1.6.2.

Is this still a concern in the latest Minecraft version 14w08a? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Still a concern in 14w08a.

Better explanation: Jumping over a carpet block and having your lower body pass through the air part of the carpet block causes the sound of landing on wool.

Still a concern in 14w21b.

It's easy to replicate just place down one carpet and jump over it a couple of times.

Confirmed in 15w46a (still an issue).

confirmed in 1.19 as still an issue