It looks like the move of PBR interface configuration was not migrated:
I believe this needs to be migrated to the policy route <ROUTE> interface location.
I think what happened here is that I had previously configured PBR, but I didn't delete the configuration node above the name of the policy itself, so that part of it remained, but no longer exists in 1.4. This also happened with traffic-policy. This doesn't actually cause an issue per se, but it causes the saved configuration on boot to not match the running configuration, which would trigger a warning when entering configuration mode.