After the third iOS 16.1 beta arrived last week, 1st-gen AirPods Pro users got a big surprise: Adaptive Transparency, one of the excellent new features announced with the 2nd-gen AirPods Pro, was added for the older model as well. Now, it seems as though that’s not actually happening. According to Mark Gurman of Bloomberg, the addition of the Adaptive Transparency toggle in the iOS 16.1 beta is “a bug” and will presumably be removed before release. As it stands, Adaptive Transparency will only be available on the new AirPods Pro, and not the 1st-gen model or AirPods Max, which both have standa…