We have reproduced the issue and have a possible workaround for you to try, but it involves running 3rd party software that's not in Adobe's control (Winaero Tweaker) so please do this at your own risk. Using the Winaero Tweaker application, if you configure the window Border size and Border padding settings to their lowest values, you should find Photoshop not truncating so much at the edges.
Meanwhile, we're working to find a proper solution to the problem.
Thanks again!
-Noel