The update broke landscape for some apps. Webcat, File Browser and quite possibly a few others. When in ladscape in those apps, edge swipes are interpreted as if the device was in portrait. A swipe from the left edge of the screen is interpreted as a swipe from the top and closes the app, right edge as bottom (opens notifications), top and bottom swipes as left and right to go back to home screen.

It is not all the apps, only some of them. So in theory they could blame those apps. But when the only thing that has changed is the OS, then I am more inclined to blame the OS.