This is a bug I found while map making. Enter the command
/playsound minecraft:block.anvil.fall player @a ~ ~ ~ 100 will not play the anvil fall sound, but will instead play /playsound minecraft:block.anvil.step player @a ~ ~ ~ 100
MC-169331
Entering the command to play the anvil falling sound plays the Anvil Step sound instead
Resolved
Invalid
0
It is the sound for falling on an anvil, you have to do anvil land not fall.
Replace block.anvil.fall with block.anvil.land