Sortable: 'update' doesn't fire when last item from one list is moved to beginning of other

Sortable: 'update' doesn't fire when last item from one list is moved to beginning of other


Example: http://www.justinstayton.com/sortablesTest.html
I have two lists setup, the first (#row1) with two items and the
second (#row2) with one item.
Try dragging 'Latest Articles' -- the single item in the second list
-- to the end of the first list, or in-between the two items. Look at
the console in Firebug for the output. 'update' gets fired twice, once
on the second list and once on the first list (in that order), as
expected. Now, refresh and try dragging 'Latest Articles' to the
beginning of the first list. Again, look at the console. 'update' only
got fired once, on the first list.
Why didn't it get fired on the second list? Is this a bug? Thanks for
any help!
Justn