In any of the views that present a preview pane (standard or widescreen), select a file so that it appears in the preview. Press control-g to see the map in the bottom-left control pane. Press control-g again and the file becomes deselected and disappears from the preview pane, through the icon that appears to the far left of the preview pane title still represents the now closed file.
Perhaps this is by design, but the expected behavior is just to open, then close, the map pane while leaving the file selected for further action.
The Maps filter pane shows files in the selected location of the Navigate sidebar, not the selection in the item list. (This is incorrectly stated in the documentation and has been revised for the next build.)
Third screenshot is immediately after pressing ⌃g to hide the map. Note the image icon still appears on the preview title bar, but the image is no longer selected. This happens regardless of file type.
