Cannot access vio0 remotely after changing from autoconf to static IP address

I have a hosted VPS running OpenBSD 7.6. It provides services on the private network (vio1) via requests sent from a reverse proxy on that network. The initial networking configuration was created by the installer, with inet autoconf being the configuration of hostname.vio0 and hostname.vio1 configured as below. I am working on adding new services that require the server to send requests from the same public IP address that requests are received on. I have successfully configured the reverse proxy server such that the server can use the reverse proxy on vio1 as the default gateway, but I would prefer to still have direct SSH access to the server on vio0. I have attempted many different configurations, and the server does not respond on vio0 using TCP or ICMP for any of them.

$ cat /etc/hostname.vio0
inet 203.0.113.55 0xffffff00
!route add 203.0.113.55 203.0.113.1

$ cat /etc/hostname.vio1
inet 172.16.27.15 0xffff0000

$ cat /etc/mygate
172.16.23.14

$ route -n show -inet
Routing tables

Internet:
Destination        Gateway            Flags   Refs      Use   Mtu  Prio Iface
default            172.16.23.14       UGS        5    33230     -     8 vio1 
224/4              127.0.0.1          URS        0        0 32768     8 lo0  
127/8              127.0.0.1          UGRS       0        0 32768     8 lo0  
127.0.0.1          127.0.0.1          UHhl       1        2 32768     1 lo0  
172.16/16          172.16.27.5        UCn        2       76     -     4 vio1 
172.16.8.18        00:16:61:69:44:2d  UHLc       0       79     -     3 vio1 
172.16.23.14       00:16:2c:9a:37:a5  UHLch      1       69     -     3 vio1 
172.16.27.15       00:16:a9:ad:ce:dd  UHL1       0       42     -     1 vio1 
172.16.255.255     172.16.27.15       UHb        0        0     -     1 vio1 
203.0.113/24       203.0.113.55       UCn        1        0     -     4 vio0 
203.0.113.1        00:16:69:c6:98:13  UHLch      1       34     -     3 vio0 
203.0.113.55       00:16:31:cb:96:41  UHL1       0       33     -     1 vio0
203.0.113.55       203.0.113.1        UGHS       0        0     -     0 vio0 
203.0.113.255      203.0.113.55       UHb        0        0     -     1 vio0

$ ifconfig vio           
vio0: flags=2008843 mtu 1500
	lladdr 00:16:31:cb:96:41
	index 1 priority 0 llprio 3
	media: Ethernet autoselect
	status: active
	inet 203.0.113.55 netmask 0xffffff00 broadcast 203.0.113.255
vio1: flags=2008843 mtu 1500
	lladdr 00:16:a9:ad:ce:dd
	index 2 priority 0 llprio 3
	groups: egress
	media: Ethernet autoselect
	status: active
	inet 172.16.27.15 netmask 0xffff0000 broadcast 172.16.255.255

$ doas cat /etc/pf.conf
ext_if = "vio0"
int_if = "vio1"
admin = "192.0.2.20"

set skip on lo

block in quick on $ext_if from urpf-failed

pass in quick on $ext_if proto tcp from $admin to port ssh

block all
pass out on $ext_if all
pass out on $int_if all

pass inet proto icmp-type 3 code 4
pass inet proto icmp-type 8 code 0
pass inet proto icmp-type 11 code 0

# By default, do not permit remote connections to X11
block return in on ! lo0 proto tcp to port 6000:6010

# Port build user does not need network
block return out log proto {tcp udp} user _pbuild

The hosting ISP can assign the public IP address using DHCP, but also provides the resolver IP address and the following networking information for the instance in their dashboard: IP address: 203.0.113.55
Netmask/Bitmask: 255.255.255.0
Gateway: 203.0.113.1
What am I missing?