E x a c t l y !
Every point you made is precisely my experience. Thanks for examining it in such detail and reporting it to Apple.
(As I noted in a post subsequent to the one you quoted, the senior Apple advisor I spent 1.5 hours with on the telephone couldn't come up with anything either, although the frontline advisor found the same thing on his machine, which is why he enlisted the help of the senior advisor — equally to no avail, I'm assuming.)
As and when (if) Apple addresses the Finder glitch, do provide a followup here.
