rs.local/config network static ethernet settings permits only definition of static IP- and DNS Server addresses. Enabling Static IP- Save and Reboot sets ‘static routers’ in ‘/etc/dhcpcd.conf’ to blank. Thereby no connection to local network ‘behind’ a router is possibe. You have to do it by editing dhcpcd.conf manualy. How to do: open ‘Static IP’
That is correct; if this bug we are aware of appears, then the way to solve it is directly editing the
dhcpcd.conf file manually following the guide you have linked.
We are working to fix this in the coming Shake OS releases. Thank you for your feedback!