Newly created directory doesnt appear in Directory Dialog

I added a directory to the Directories Dialog, with a filter of Normal.
Lets pretend it was /Users/carpii/test

After a scan completed, I then ticked some files and selected Actions -> Move to Directory.
At this point I cerated a new directory /Users/carpii/test/dupes and moved all the files there.

Now I want to rerun the scan, excluding the Dupes dir, just to make sure everything is ok.
I go into the Directory dialog, and expand the /Users/carpii/test node.

The dupes directory is not visible, and trying to add it via the Add button results in the error 'Directory is already added'

Removing the test directory and readding it corrects this