This is still broken. The post-connect.d workarounds don't work because NetworkManager doesn't get openconnect to use vpnc-scripts any more. So the problem is with nm-openconnect-service-openconnect-helper I guess.

When debugging passed env vars I get (extract)
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_2_MASKLEN=0
Jul 07 08:48:45 Herbie NetworkManager[634766]: LANGUAGE=en_AU:en
Jul 07 08:48:45 Herbie NetworkManager[634766]: NM_DBUS_SERVICE_OPENCONNECT=org.freedesktop.NetworkManager.openconnect.Connection_29
Jul 07 08:48:45 Herbie NetworkManager[634766]: NM_VPN_LOG_SYSLOG=1
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_0_MASKLEN=32
Jul 07 08:48:45 Herbie NetworkManager[634766]: PWD=/
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_1_MASKLEN=32
Jul 07 08:48:45 Herbie NetworkManager[634766]: LANG=en_AU.UTF-8
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_2_ADDR=0.0.0.0
Jul 07 08:48:45 Herbie NetworkManager[634766]: INTERNAL_IP4_NETADDR=192.168.220.116
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_0_ADDR=10.241.17.31
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_CSTP_OPTIONS=split-include=10.241.17.31/32
Jul 07 08:48:45 Herbie NetworkManager[634766]: split-include=10.241.17.30/32
Jul 07 08:48:45 Herbie NetworkManager[634766]: split-include=0.0.0.0/0
Jul 07 08:48:45 Herbie NetworkManager[634766]: search=officeworks.internal
Jul 07 08:48:45 Herbie NetworkManager[634766]: DNS=10.241.17.31
Jul 07 08:48:45 Herbie NetworkManager[634766]: DNS=10.241.17.30
Jul 07 08:48:45 Herbie NetworkManager[634766]: netmask=255.255.255.255
Jul 07 08:48:45 Herbie NetworkManager[634766]: ipaddr=192.168.220.116
Jul 07 08:48:45 Herbie NetworkManager[634766]: INVOCATION_ID=e13e358d737b41ef83b74684c4fdcef3
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_1_MASK=255.255.255.255
Jul 07 08:48:45 Herbie NetworkManager[634766]: INTERNAL_IP4_DNS=10.241.17.30 10.241.17.31
Jul 07 08:48:45 Herbie NetworkManager[634766]: INTERNAL_IP4_NETMASK=255.255.255.255
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC=3
Jul 07 08:48:45 Herbie NetworkManager[634766]: INTERNAL_IP4_NETMASKLEN=32
Jul 07 08:48:45 Herbie NetworkManager[634766]: INTERNAL_IP4_MTU=1422
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_1_ADDR=10.241.17.30
Jul 07 08:48:45 Herbie NetworkManager[634766]: SHLVL=1
Jul 07 08:48:45 Herbie NetworkManager[634766]: VPNGATEWAY=MYCOMPANYVPNIP
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_DEF_DOMAIN=MYCOMPANY.internal
Jul 07 08:48:45 Herbie NetworkManager[634766]: INTERNAL_IP4_ADDRESS=192.168.220.116
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_0_MASK=255.255.255.255
Jul 07 08:48:45 Herbie NetworkManager[634766]: TUNDEV=vpn0
Jul 07 08:48:45 Herbie NetworkManager[634766]: CISCO_SPLIT_INC_2_MASK=0.0.0.0
Jul 07 08:48:45 Herbie NetworkManager[634766]: GIO_USE_VFS=local
Jul 07 08:48:45 Herbie NetworkManager[634766]: JOURNAL_STREAM=9:24405
Jul 07 08:48:45 Herbie NetworkManager[634766]: PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
Jul 07 08:48:45 Herbie NetworkManager[634766]: reason=connect
Jul 07 08:48:45 Herbie NetworkManager[634766]: NM_VPN_LOG_PREFIX_TOKEN=634703
Jul 07 08:48:45 Herbie NetworkManager[634766]: NM_VPN_LOG_LEVEL=0
Jul 07 08:48:45 Herbie NetworkManager[634766]: _=/usr/bin/env

I also get, tellingly:
Jul 07 08:48:45 Herbie NetworkManager[634767]: nm-openconnect[634703] <warn>  [helper-634767] Ignoring invalid static route prefix '0'