The bug
When launching the game, the following error message shows up in the log:
Missing sound for event: minecraft:block.smithing_table.useAlso, when upgrading a tool/armor piece with netherite, no sound is played.
Code analysis
The sound event is not defined in the sounds.json file, although the sound file itself exists.
Though the sound event is missing villagers use the smithing table use sounds by themselves and can played with this command: