1.21.1-rc1 added distinct sounds and sound events for placing, breaking, hitting and stepping on spawners instead of using block.metal like it did, but these events apparently fail to be registered to spawners properly. Namely, the event strings block.spawner.* cannot be found in decompiled source, namely in net.minecraft.sounds.SoundEvents.

Steps to reproduce

1. Place a spawner, and note the sound being played
2. run /playsound minecraft:block.spawner.place, and note the sound being played
3. run /playsound minecraft:block.metal.place, and note the sound being played

Expected result

The sounds played in step 1 and 2 match, and are different from that of step 3.

Observed result

The sounds played in step 1 and 3 match, and are different from that of step 2.