scrolling can change pages in a pdfviewer at any zoom level

Steps to Reproduce

1. run

    <div height="500px">
        <pdfviewer src="Bill.pdf" vflex="1" />
    </div>

2. try to scroll down to the next page

Current Result

you can't. You can only scroll to the bottom of the page.

When a page is partially visible, scrolling can only allow you to scroll inside the current page. You can't scroll to another page.

Expected behavior

scrolling up/down can freely change to different pages.