I cannot reproduce the Browser rotation problem on Xperia X but on Jolla it is quite the opposite: I cannot avoid reproducing it.

The bug in #9 is 100% reproducible on both, as long as you have a patch installed that enables any screen rotation. Open at least three applications. It makes no difference which ones. Go to the home page. Rotate the phone to landscape. Go to any open application. Rotate the phone to portrait. Swipe back to the home page. Voilá!

Rotating the phone in the home page fixes it.