If you accidentally select a folder in the file chooser, there's no easy way to deselect it.

If you've selected a folder, clicking Save navigates to that folder instead of saving the file. Navigating back to the desired folder remembers which folder you selected the last time you were there, which means it's basically impossible to save a file in the correct folder once you've accidentally selected a folder.

I'd expect clicking in the blank area in the file/folder list to deselect the current selection except a) it doesn't and b) if there are enough files in the folder, there's no blank area to click in the first place.

(The only way to deselect a folder once selected involves either editing the file name in the text entry field or clicking on the bookmarked locations on the left side of the dialog and then navigating back to your desired folder location. This is absurd.)

I seem to recall that clicking the depressed button for the current folder used to deselect an errant selected folder, but this doesn't work anymore (assuming it ever did).