When Main hand is left hand, The sweep attack animation still goes right to left

When Main hand is left hand, The sweep attack animation still goes right to left

What I expected to happen was...:
The sweep animation should match the swing animation and move from left to right

What actually happened was...:
The sweep animation is the same as the right hand swing causing a very strange visual

Steps to Reproduce:
1. Change your characters main hand to left hand

2. Perform a sweep attack with a sword on a mob