I'm using Reader for Android (version 11.4.1) on my tablet to read e-books and magazines where the content is often stretched across two pages.
The problem is that the pair of pages meant to go together are not shown in the same slide. Instead, one page from a given pair goes beside a page from another pair. This is particularly irritating when it comes to pictures, which get broken up between slides.
That can be seen right away with the cover page being on the same slide with the following page, when it should be on its own.
The two-page viewing mode doesn't quite help this way.
If that's an issue with Reader itself, please consider fixing it in future versions.