Picture in picture mode doesn't go back to full screen sometimes and even the app won't open.If i am playing a video on YouTube via PIP, i have to force stop the app to stop the videos.Same goes for WhatsApp (didn't try it with duo or any other video...
Not the security patch, just the play services update.You can get it by going into setting > about phone > software information > Google play system update.
That is not how this works. The date of release of the phone decides which phone is eligible for which update.I am an m52 user myself and I was well aware that we won't get the Android upgrade but we will still get the Android security update.