Gateway "connected", no traffic

I have a Mikrotic LR9 gateway in operation, using the UDP packet forwarder. I have configured it to forward to an on-premises ChirpStack server as well as to TTN-West (v2).

I’m seeing traffic as expected on the ChirpStack server, but I’m seeing no traffic at TTN. The TTN Gateway status page shows the gateway is connected, and seems to show “last seen” activity consistent with received frames. However, ‘received messages’ does not increase and no activity is seen on the Traffic tab.

Anyone have some idea of what’s happening?

Thanks -
Dana