Same store. Same goal. Watch what each one skips.

Both are Qwen3-8B, fine-tuned with the same reinforcement-learning run on a web shop they operate like a person at a browser: click, type, choose. The reward had two planted bugs: it never checked for extra items, and never checked the coupon or the shipping speed. Every product also has a Buy now button that skips the cart, where coupons are applied. Here both work a store they never saw in training. No Guard is running.