minecraft.killed_by:fireball doesn't increase when killed by fireball

The Bug:

minecraft.killed_by:fireball doesn't increase when killed by fireball.

Steps to Reproduce:

• Create a scoreboard objective for tracking being killed by fireballs and set it to display on the sidebar.

• /scoreboard objectives add Fireballed minecraft.killed_by:minecraft.fireball

• /scoreboard objectives setdisplay sidebar Fireballed

• Make sure the gamemode is survival or adventure, stand on the ground and summon a fireball, then jump and hit it downwards to take damage from it's explosion.

• /summon fireball

• Repeat till death.
• After getting killed by a fireball, check if the scoreboard increased.

Observed Behavior:

The scoreboard doesn't increase.

Expected Behavior:

The scoreboard would increase.