Another trick you can try is to swap the 2 hub antennas, maybe the one for zigbee got damaged.
You said you just removed all apps, but I would suggest to give Zigbee Map community app a try. It talks to every device in the zigbee mesh and draws a visual representation of the found "connections". Note: you would need to have the HPM (Hubitat Package Manager) community app already installed, in order to install Zigbee Map though (so yeah, another app 
)
Disclaimer: I am the author of Zigbee Map.
