Using a C4 with 2.3.5.146, hub/zigbee/getChildAndRouteInfo currently shows 2 Child Data unknowns, and 5 null Route table devices.
Earlier today on 2.3.5.146 there were 4 Child Data unknowns, and 2 null Route Table devices. The unknown Child Data devices also show on the Zigbee Graph as unknown
After reverting to 2.3.5.141 there was 1 unknown Child Data device.
What I've done so far.
On 2.3.5.146 Shutdown hub, pulled power for 15 minutes, restarted hub (4 unknown child devices)
Reverted to 2.3.5.141 ( 1 unknown Child Data device: 5)
Restored to 2.3.5.146( 2 unknowns device 2 and 5, and 5 null routes)