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
Can confirm in 20w51a.