Breaking Endstone while being submerged in water is too fast

[christopherplaysminecraft]

General Information

Release 4.0.3
Version 1.8.x

Bug Description

Noticed it recently while playing BedWars, 99% sure it's this.
Breaking Endstone while being submerged in water mines the block too fast, causing weird lagbacks of the block on Hypixel.

Steps to Reproduce

1. Mine Endstone while being submerged in water
2. Mine it too fast

Expected Behavior

1. Mine Endstone while being submerged in water
2. Mine it just right