Copper Bulbs have unused "turn_off" sound

In the files of the snapshot, there are two sounds for Copper Bulbs: one for turning them off, and one for turning them on.

However, in the sounds.json file, only the "turn_on" sound is ever used, being pitched down for the off sound event.

(used)

(unused)

"block.copper_bulb.turn_off": {
    "sounds": [
      {
        "attenuation_distance": 6,
        "name": "block/copper_bulb/turn_on",
        "pitch": 0.75
      }
    ],
    "subtitle": "subtitles.block.copper_bulb.turn_off"
  },
  "block.copper_bulb.turn_on": {
    "sounds": [
      {
        "attenuation_distance": 6,
        "name": "block/copper_bulb/turn_on"
      }
    ],
    "subtitle": "subtitles.block.copper_bulb.turn_on"
  },

Current Behaviour:

Expected Behaviour: