I've recently started using the "Unread feeds" filter and am using the 2.0.4 advanced edition of Awasu.
It's a hard bug to describe, but here's how to make it happen:
There's enough feeds to cause a scroll bar at full screen.
I scroll to the bottom and begin reading one by one.
When I leave one or more at the bottom of the list and read the next to last, eventually the scroll bar disappears and a gap appears at the top of the list - and there's still one feed that is off the bottom of the screen (and needs a scroll bar to reach but one is not available).
This is not a big deal since I can switch filters and then switch back to that filter and all si fine but thought you would want to know.