Bad Omen effect doesn't trigger if the pillager captain dies by fire after being hit by the player (flame bow or fire aspect sword)

The Bug

In Minecraft 1.14.1, when you shoot a pillager leader with a power 5, flame bow, the pillager is knocked down to 5 hit points.  The damage from the flame is enough to kill it, but the player does not receive the bad omen effect. When testing this with a normal power 5 bow, it takes 2 shots to kill the pillager, and gives the player a level of the bad omen effect. After killing several leaders, you only receive the effect when you do the last hit point of damage.  

To Repeat:

• Summon/find a pillager with the banner.
• /give @p bow
• /enchant @p power 5
• /enchant @p flame
• Draw the bow fully back, and then shoot the pillager once.  It will be knocked down to 5 health, and then will die from fire damage.  The player does not receive the bad omen effect.

Observed Behavior:

The bad omen effect isn't granted when pillager captains die from the effects of flame or fire aspect enchantments after being attacked by players.

Expected Behavior:

The bad omen effect would be granted when pillager captains die from the effects of flame or fire aspect enchantments after being attacked by players.