Two-Handed weapons don't receive attack/speed penalty when off-hand slot is occupied

Steps to reproduce:

Create a fresh 1.16.5 profile in Curseforge (tested on both the latest Forge version and 36.2.20 where I remember it still worked)
Only install Epic Knights + dependencies, no other mods
In a new world, try using any weapons with a two-handed tag
Equip a shield/other item in the off-hand slot and repeat step 3
Observe that while there is red text saying the damage and attack speed should've dropped due to off-hand slot being occupied, in reality the damage and attack speed do not change and stay the same

Attack/speed reduced when the off-hand slot is occupied

Attack/speed doesn't change

1.16.5 Forge

Edit: Tried manually downloading an older version of the mod (6.3v). On an older version this bug is not present.

[ ] I agree that I am inattentively reading the description, just filling out everything

Magistu / Epic-Knights