When I have dolphin open in folder /tmp/foo and then externally run rmdir /tmp/foo, dolphin displays /tmp/foo (deleted). When I then later run mkdir /tmp/foo I would expect that pressing F5 in dolphin should show the new folder contents but instead it attempts to show "/tmp/foo (deleted)" which obviously doesn't exist.
No longer valid, as Dolphin (tested with v.17.12.2) is now only showing a warning ("The file or folder /tmp/foo does not exist"). Therefore, if the folder is created again, Dolphin will show the correct contents of the folder :)