High looting values apply even if the weapon is not used to do the kill

I've messing around lately with insanely highe enchantment values(lvl 32767 more exactly) and I've discovered a weird bug that applies the high looting value even though you're not using that weapon. Now before you reject this bug saying "Who will ever get that enchantment level on a sword?". I have a reason for this.You see maybe somebody would compile a datapack that if a player does something, it would be rewarded with an OP box or something and in that box it would contain that sword and a op potion, and it would be really weird that this happens.

Anyway, without any more talking, let's see how to reproduce this bug

Step 1. Get the mentioned sword

Type in chat: /give @p diamond_sword{Enchantments:[{id:looting,lvl:32767}]} 1

Step 2. Get the potion

Type in chat: /give @s minecraft:splash_potion{CustomPotionEffects:[{Id:6,Amplifier:28,ShowParticles:0b},{Id:7,Amplifier:28,ShowParticles:0b}],CustomPotionColor:16712972,display:{Name:"{\"text\":\"Potion\"}"}} 1

Step 3. Put sword in main-hand and potion in off-hand

Step 4. Go to a mob that its drops are affected by the looting enchant(Zombies,creepers,etc) and RIGHT-CLICK.

Yeah, it's verry weird and it should be fixed