In the "SSH" tab of the "Edit Favorite
" there is a pop-up
menu for "Method". Next to entries for port forwarding,
there is one that says "Request tty".
A pop-up menu is supposed to be an XOR, so users presume a
tty will not be requested when port forwarding is choosen,
yet the trace shows it is requested, and we do get a shell.
I don't want that shell. But, then you will need to develop
another UI to close a tunnel.
For know, I propose to rename the menu entry to "No port
forwarding" instead of "Request tty".