Resolved this using @mike12489 's post here as a guide.
My specific steps:
1. Shut down HASS system
(Restart Home Assistant/Advanced Options/Shut Down System)
2. Disconnected power from HASS system
(unplug USBC from Raspberry Pi)
3. Power down POE/ZAC93
(unplug network cable)
4. Wait 30 seconds
5. Power on HASS system, leaving POE/ZAC93 powered down
(plug USBC into Rpi)
6. Wait for HA to fully start up
7. Shut down HASS system
(Restart Home Assistant/Advanced Options/Shut Down System)
8. Disconnected power from HASS system
(unplug USBC from Raspberry Pi)
9. Wait 30 seconds
10. Power on POE/ZAC93
(plug in network cable)
11. Power on HASS system
(plug USBC into Rpi)
12. Confirm Z-Wave JS is able to reach the controller again.