One of the issues that I’m encountering is because their is now viewport height or width options, you aren’t actually able to independently scroll multiple frames. Ie if you want to be able to scroll a side menu bar independentally of the content. You actually aren’t able to do this unless you set a specific height for the page and then clip the content to be able to scroll the overflow.
The issue with this is because the you have defined a fixed height for the page, it’s not actually recognising the dimensions of the viewport, so if the viewport in the browser window changes it’s size relative to the fixed height you specified in the Figma Sites. It actually breaks the scroll behaviour because you haven’t been able to tell the page that the actual height of the page it needs to be referencing is not the fixed height defined in Figma Sites but should in fact be 100% fill to the vertical viewport height instead.