If you have Camera open ready to take a shot and want to access the Control Centre then beware ...
The first "single finger upwards swipe" changes the framing from Photo to Square and does not open the Control Centre, it's the second swipe that does that!
Whilst a cursory glance at the screen would, of course, show the Square frame it is not always that you would look at the screen when taking a picture, you would be looking at the overall "shot" - in which case you may overlook the change.
As I said in the heading, not a "bug" in the accepted case but an irritation because something not blindingly noticeable happens which doesn't normally happen.
It would be a real pain to get back to Maison Moi after a world tour and find that a number of your best pictures were square rather than portrait or landscape.
And no, I haven't been on a world tour (although I have been abroad) and I did manage to spot the "feature" early enough to retake the first photographs and check that I hadn't inadvertently changed framing every time!