The bug

The block.stone.place sound plays the same sound as block.metal.place when using /playsound. I expect block.stone.place to play the exact same sound as when placing a stone block, but it does not. Instead, it seems to be exactly equal to the block.metal.place sound and it requires a pitch of around 0.8 to correctly play the sound.

How to reproduce

Use the following commands in succession:

/playsound minecraft:block.metal.place block @a ~ ~ ~ 1.0
/playsound minecraft:block.stone.place block @a ~ ~ ~ 1.0

→ You'll notice that these sounds are exactly the same

Next, use the following commands in succession:

/playsound minecraft:block.metal.place block @a ~ ~ ~ 1.0
/playsound minecraft:block.stone.place block @a ~ ~ ~ 1.0 0.8

→ You'll notice that the block.stone.place sound now plays the correct sound, that is different from the block.metal.place sound