Disassociate Router from EVPN does not remove the table=21 entries

neutron net-create network1
neutron subnet-create network1 11.0.0.0/24 --name subnetwork1 --enable-dhcp
neutron port-create network1 --name network1port11
neutron port-create network1 --name network1port12
neutron port-create network1 --name network1port13
neutron port-create network1 --name network1port14

neutron net-create network2
neutron subnet-create network2 12.0.0.0/24 --name subnetwork2 --enable-dhcp
neutron port-create network2 --name network2port21
neutron port-create network2 --name network2port22
neutron port-create network2 --name network2port23
neutron port-create network2 --name network2port24

nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port11' | awk '

{pr int $2}') myhost11 --availability-zone nova:XFT11-FT-BASAV-CSS1
sleep 20
nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port12' | awk '{print $2}

') myhost12 --availability-zone nova:XFT11-FT-BASAV-CSS1
sleep 20
nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port13' | awk '

{pr int $2}') myhost13 --availability-zone nova:XFT11-FT-BASAV-CSS2
sleep 20
nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port14' | awk '{print $2}

') myhost14 --availability-zone nova:XFT11-FT-BASAV-CSS2
sleep 20
nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port21' | awk '

{pr int $2}') myhost21 --availability-zone nova:XFT11-FT-BASAV-CSS1
sleep 20
nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port22' | awk '{print $2}

') myhost22 --availability-zone nova:XFT11-FT-BASAV-CSS1
sleep 20
nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port23' | awk '

{pr int $2}') myhost23 --availability-zone nova:XFT11-FT-BASAV-CSS2
sleep 20
nova boot --image cirros-0.3.4-x86_64-uec --flavor myhuge --nic port-id=$(neutron port-list | grep 'port24' | awk '{print $2}

') myhost24 --availability-zone nova:XFT11-FT-BASAV-CSS2

And once all VNFs are up created and added the subnetwork1 and subnetwork2 to router as interfaces.

neutron router-create RouterSNAT
neutron router-interface-add RouterSNAT subnetwork1
neutron router-interface-add RouterSNAT subnetwork2

I created EVPN and associated router to EVPN..
After few minutes,I disassociated and see that table=21 entries did not disappear. I think it may be due to null pointer exception while reading the fib entries,,Bug Number : 8294
But please check logs for the exact reason and close the bug accordingly.