When using ControlMaster and ControlPath for bastion connections when I resume from sleep Core Tunnels shows my connections as green and up but using said connections fails.
Taking a look with cmc shows that the connection is stale:
WARNING: Stale ControlMaster connection socket Removing: /Usersfirstname.lastname@example.org
Manually disconnecting and reconnecting the tunnel fixes the issue, but it's manual not automatic. Better handling for stale connections upon resume from sleep would be nice.