2. Go to <site>/admin.php?permissions/definitions
3. In the "Filter Items" box to the right of "Permission Definitions", type in 'asdf' without quotes so you get "No items matched your filter."
4. Without hitting the Clear button, simply backspace on your 'asdf' until you get "Showing x of y items"
5. Notice the list isn't populated. The li elements aren't getting their display properties properly reset until the Clear button is hit.
This doesn't seem to affect the Template list filter, but maybe it's occurring in another area that uses the similar system.