Issues with ROUTE_ERROR_MANY_TO_ONE_ROUTE_FAILURE and trying to add SLZB-07 as router

[ShadowBelmolve]

Good morning,
I'm currently using a SONOFF Zigbee dongle and everything was working fine up to Zigbee2MQTT version 2.7. Shortly after upgrading, I started getting many ROUTE_ERROR_MANY_TO_ONE_ROUTE_FAILURE messages.

I downgraded back, but the issue persisted. I'm not yet sure if the problem was actually caused by the update or if something else happened around the same time that made it look like the update was the cause.

To try improving stability, I flashed an SLZB-07 I had on hand with router firmware, hoping to add it to the network. Currently, I only have a TS0207 Tuya repeater acting as a router, and I remember seeing comments that this device might cause issues.

My idea was to use the SLZB-07 as a replacement router, but Zigbee2MQTT doesn’t seem to recognize what kind of device it is, and I believe it's not being used properly in the network.

Does anyone know how to configure Zigbee2MQTT to correctly use the SLZB-07 as a router?

I’m aware that changing the Zigbee channel might help, but I’d like to avoid re-pairing all my devices if possible.

I flashed the SLZB-07 using the official SMLight flasher tool (https://smlight.tech/flasher/#SLZB-07), selecting the router firmware option.

Thanks in advance!

[ShadowBelmolve]

This is my current network

Early today it had a lot of devices disconnected from the network.