FTP site opened from tree sent to wrong pane

If I open an FTP site from the Folder Tree in a dual pane lister, it is opened in the left-hand pane, even I have the right-hand pane set to source.
Opening the site from the FTP menu correctly sends it to the source pane, regardless of its position.

Is this intentional behavior, or is it a bug?

I solved it!

Had to check "Share single tree between dual file displays"