Thank you for the reply and immense detail! The spot you are pointing at is the exact area. Below are pictures of the left and right boot. It starts at the last 1/8” of the rubber toe cap and ends just before that swoosh shape on the side of the sole where your pen cap is. From further inspection it looks like the rubber sole is chamfered where it meets the upper and is connected/glued further down in the gap. This is similar on both left and right boot.