Just upgraded to an iPhone 6s, and using the boarding pass feature from Southwest for the first time. I opened the passbook attachment from my Gmail app, and the boarding pass is "cropped" around the entire border. It stays centered, so it's impossible to press the bottom corners of the boarding pass to change settings, but the bar code is visible and should scan. As a matter of fact, the text box that displays the "Passes" prompt is also zoomed/cropped.
Is this a known issue? I can't find it from the 5 minutes of searching I've done.