Dissociates l3vpn from router and then Associates with network has 100% packet loss

Steps:
1. l3vpn associated with router which has two subnet and corresponding VMs.
2. Datapath test works fine.
3. Dissociate l3vpn from router.
4. Remove interface from router and delete router.
5. Associate l3vpn with network
6. Verified fib entry and flow table 21, which has corresponding entry.
7. But datapath test failed between networks and its 100% packet loss.
8. Also tested OVS restart , which also has same behavior like 100% packet loss.
9 But when i did one VM instance restart on one of the network, the datapath works fine between networks.

Attached the ODL Sandbox log which has ODL and OVS dump.

Issue observed on both carbon and boron.