Breaking sharp edges by using the 2D Chamfer toolpath.
Manufacture > Milling > 2D > 2D Chamfer 
2D Chamfer creates a beveled edge on the part model. This part doesn't have a Chamfer modeled on it's edges, but sometimes 2D Chamfer is used to remove any sharp edges on a part.
The final toolpath should look like the picture below. Notice how the edge on the open pocket is not chamfered to the end. That would break the tool and damage the part. Fusion is smart enough to cut what is possible and avoid damaging toolpaths.
