Multi-WAN and "arpresolve: can't allocate llinfo"

[demyers]

I've been using Multi-WAN for failover via Policy Routing and Gateway Groups on 25.7.X. After upgrading directly from 25.7.11 to 26.1.1, the system log fills with "arpresolve: can't allocate llinfo for %d.%d.%d.%d" errors for the primary (lowest tier) WAN interface. Multi-WAN still appears to work, but the messages continue to be generated. This is before attempting to migrate to the new Rules interface. Rebooting does not help. I've rolled back to a 25.7.11 snapshot and all works as before.

So something must have changed in 26.1. Suggestions?

Thanks!