[Snowy Soul]

In addition, I've just confirmed that this bug will work with any offhand while using Ambidexterity as I've switched the offhand to an Axe and Cutthroat still applied the offhand weapons damage.

After attempting the opposite with a Dagger in the offhand and a sword in the mainhand the bug did not occur and with Ambidexterity toggled both on and off Cutthroat would use the dagger no matter the instance.

Hope this is enough to figure out what's causing this, it's minor but it is significantly upping Cutthroats damage due to it deferring to offhand like that through Ambidexterity. I tested this more thoroughly at the Arena, just trying to be thorough.