minecraft.custom:minecraft.jump triggered by getting hit by a player's melee attack

The bug

Getting hit by a player's melee attack increases the value of minecraft.custom:minecraft.jump.

How to reproduce

1. /scoreboard objectives add jump minecraft.custom:minecraft.jump
2. /scoreboard objectives setdisplay sidebar jump
3. Get punched by a player and notice that the jump score increases

Note: score does not increase from non-melee hits and non-player attacks