Hi, I have this update. And it has one new feature. In dark mode options is now possible to add it into individual apps. I did not have this feature before.
But this update bring new problem. If i download pdf file i can not choose app for opening. It opens random app.
I think you might have missed it so far, but I remember to have separate dark mode setting for individual apps since... last year, I think. On the other hand, it looks like you are right about the PDF bug. I just checked and it does the same for me. :D