Instead of using the vault's eight step sounds, block.vault.fall only uses stone's first step sound.
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It calls the correct sound event, it's just that the sound event plays the wrong sounds. The file is sounds.json.
Can confirm. 23w05a's sounds.json file can be found at .minecraft\assets\objects\c5\c5eb41adbd0c7db7d67d809df327e074d48e5211 (found from https://piston-meta.mojang.com/v1/packages/b41516451dc0872b0c92f6ddcba408253b2472d7/12.json), where this issue can be seen.
What file is shown in the screenshot? I cannot find it. Checking the code, it seems the block uses the right sound.
In SoundTypes.java