Missing exec_fib from gui (jail networking tab) for jail creation and edit since upgrade to Truenas core 12.0U1

unable to assign a specific routing table to the jails via the GUI any more.

Each vlan has a separate gateway so jails in different vlans have a different routing table to avoid async routing being introduced.

With this setting removed from the gui. require me to first assign static ip to jail or plugin in the correct subnet (or use incorrect subnet for initial setup). Then shutdown jail and add fib manually.

Then I can change to dhcp (and change to correct bridge if used initial incorrect subnet).