When hitting a mob really fast, your sword loses extra durability (MCPE-167031) and the mob takes insane knockback. When butterfly clicking, you can do broken knockback and lose several durability from one hit. In the video, I do slow clicking the first time (1-2 CPS), then spamming normally (7 CPS), then butterfly clicking (20 CPS). Using resource pack to see tool durability, but bug still occurs without the pack.

Related to MCPE-157812 and MCPE-157150

How to reproduce:

1. Know how to butterfly click, jitter click, or download and use an autoclicker
2. Get a knockback II sword
3. Spawn a zombie
4. While sprinting, hot the zombie and spam click

Observed results:

The zombie takes insane knockback when spammed

Expected results:

The zombie should take a normal amount of knockback when spammed