Managed routes overwrite existing routes on OPNsense

I have two OPNsense routers each with their own WAN connection and connected to the same shared LAN. Both are connecting to the same ZT network. Within that ZT network, one of the routers is set as a Managed Route gateway. The router that isnt the gateway has its LAN subnet pointing to the wrong interface and becomes entirely inaccessible from the LAN.

Local LAN: 192.168.100.0/24
ZT LAN: 192.168.200.0/24
Managed Route: 192.168.100.0/24 > 192.168.200.1

Router 1:
LAN: 192.168.100.1
ZT: 192.168.200.1

Router 2:
LAN: 192.168.100.5
ZT: 192.168.200.5

With this configuration, Router 2's LAN subnet (192.168.100.0/24) is now pointing to the ZT virtual address of Router 1 (192.168.200.1) instead of its own local interface, even though it is physically directly connected to that LAN.

Before adding a managed route locally, I think ZT should make the effort to see if that subnet already exists. If it does, no action should be taken.

No source file, test, or entry point is named. Start by reproducing the two-router OPNsense setup with the listed LAN, ZT, and managed-route addresses, then trace how a managed route is installed when the subnet already exists locally; done means the local route remains preferred and Router 2 stays reachable from the LAN.