Assassin's Creed Jade gameplay has leaked, and not for the first time. The start of the Assassin's Creed Jade closed beta test is here, giving players a chance to check out the mobile game early before release. It took just a few hours for gameplay to appear online from the closed beta test, even though participants likely would've signed documents prohibiting them from doing this. As chronicled over on a ResetEra thread, there are roughly 10 minutes of new gameplay out there on YouTube, accompanied by a few minutes of loading screens. The gameplay starts out with the typical Assassin's…