Sorry, the bug for me is that is at the point of opening the app switcher, the OS is in landscape mode even though the device is portrait locked. If you're saying that when then going into another app from here it's able to recover and go back into portrait, that's good news. But again the fact an app can somehow trick the OS into thinking it's in landscape (it's fine for the app itself to display in whatever orientation it choses) then something is wrong with iOS imo. edit: thinking about it more maybe this is just useful behaviour so ignore meTry this: Lock the screen rotation from Control Centre, open Message app, then open YouTube and play a video in fullscreen. While playing the video, double press the home button to open app switcher and from there select Message. How does Message app open? For me it is finally in portrait mode as it used to be in iOS 8. It wasn't the case on iOS 9 until 9.2b2.
What is your device? I'm on iPhone 6. Maybe it have not been fixed for some devices and should be reported.
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