If you do a clean install of vyos "vyos-1.2-rolling-201910110117-amd64.iso" as of right now that's the latest rolling release, DHCP configuration will fail to save.
Commands Executed:
set service dhcp-server shared-network-name 'LAN' authoritative
set service dhcp-server shared-network-name 'LAN' subnet '172.16.0.0/24' range 0 start '172.16.0.150'
set service dhcp-server shared-network-name 'LAN' subnet '172.16.0.0/24' range 0 stop '172.16.0.254'
set service dhcp-server shared-network-name 'LAN' subnet '172.16.0.0/24' default-router '172.16.0.1'
set service dhcp-server shared-network-name 'LAN' subnet '172.16.0.0/24' dns-server '172.16.1.1'
set service dhcp-server shared-network-name 'LAN' subnet '172.16.0.0/24' domain-name 'internal-net'
set service dhcp-server shared-network-name 'LAN' subnet '172.16.0.0/24' lease 86400
INTERFACES:
eth0 = WAN = 172.16.1.52/24
eth1 = LAN = 172.16.0.1/24
Screenshot of error on commit: