Stinger Zombie Bug

so i was just playing stinger for a piece of change from the speed zombie, and i noticed the gravity bug which everyone was abusing it without even me noticing even VIPs were abusing so here's a demo : https://filebin.net/1hskug6gjyrmaq0l

in the demo it's clear no need for explanation and i hope it gets fixed ASAP because it's very problematic and unfair for the humans side.