the following screenshot can be reproduced by these steps:
— Start the Download of a folio
— Open the subscription tile web view
— wait for the folio to auto-open after the first page finished downloading.
The folio is landscape only.
You can then navigate through the folio, wich is partly visible and partly overlaying the screen. You can even go back to the library in this clipped overlay. Closing the subscription web view force closes the app.