Creating FLAT and VLAN networks both sharing the same physical network doesn't work

As you can see on the report below floating ip and snat tests fails.
On this report there are 2 networks one with vlan and the other with vxlan.
L2 and L3 tests pass but external network tests failed.

We can see that there are missing rules in t28 and t81.

https://logs.opendaylight.org/sandbox/jenkins091/netvirt-csit-1node-openstack-newton-nodl-v2-upstream-learn-revital-boron/5/archives/log.html.gz