Embedded scope mismatch

[edz]

I'm am seeing the below error in my system log repeated twice every 10-20 seconds,

kernel		sa6_recoverscope: embedded scope mismatch: fe80:3::be30:d9ff:fee6:328d%1. sin6_scope_id was overridden

This is on my failover WAN interface and the IP is the gateway address as seen on the Status page. I have tried changing the WAN4G interface scope form 56 to 64 but it doesn't seem to have made a difference:

Edit: I'm running 2.4.5.