Intersite Thread Status

I have the receiving side on an inter-site route with a weird last read date.

It has the protocol set to file, the inter-site routing port, and has the checkbox checked “Messages routed to this connection”.

Transactions are flowing through without issue, but the “Last Rd” is for 20 days ago even though data has gone through today. I “Zero Stat” the interface and it clears the field, and then I bounce the interface, and it populates the same date/time from 20 days ago.

Can someone explain to me what is happening?