I can't reproduce it, VyOS 1.4-rolling-202209290218
Config:
vyos@r14:~$ show conf com | match openv set interfaces openvpn vtun10 hash 'sha1' set interfaces openvpn vtun10 keep-alive failure-count '60' set interfaces openvpn vtun10 keep-alive interval '10' set interfaces openvpn vtun10 local-host '203.0.113.1' set interfaces openvpn vtun10 local-port '1194' set interfaces openvpn vtun10 mode 'server' set interfaces openvpn vtun10 openvpn-option '--data-ciphers-fallback BF-CBC' set interfaces openvpn vtun10 openvpn-option '--data-ciphers AES-128-CBC:AES-128-GCM:AES-256-CBC:AES-256-GCM:BF-CBC' set interfaces openvpn vtun10 openvpn-option '--comp-lzo yes' set interfaces openvpn vtun10 openvpn-option '--allow-compression yes' set interfaces openvpn vtun10 openvpn-option '--push redirect-gateway def1' set interfaces openvpn vtun10 openvpn-option '--push remote-gateway 10.9.1.1' set interfaces openvpn vtun10 openvpn-option '--push dhcp-option DNS 8.8.8.8' set interfaces openvpn vtun10 protocol 'udp' set interfaces openvpn vtun10 server client-ip-pool start '10.9.1.10' set interfaces openvpn vtun10 server client-ip-pool stop '10.9.1.99' set interfaces openvpn vtun10 server domain-name 'vtr.example.com' set interfaces openvpn vtun10 server max-connections '1000' set interfaces openvpn vtun10 server name-server '10.8.0.1' set interfaces openvpn vtun10 server subnet '10.9.1.0/24' set interfaces openvpn vtun10 server topology 'net30' set interfaces openvpn vtun10 tls ca-certificate 'ca' set interfaces openvpn vtun10 tls certificate 'cert' set interfaces openvpn vtun10 tls dh-params 'dh' set interfaces openvpn vtun10 use-lzo-compression vyos@r14:~$
Op-mode
vyos@r14:~$ show openvpn server