Comment 14 for bug 1811222

Storage of the interface information happens in 2 stages for registration.

Stage 1 is that just plain physical interfaces are created with mac addresses but no links to any vlans or IP addresses.

Then Stage 2 after network discovery has ran on the controller for a moment is updated into the database that is where the VLAN linkage with IP addresses and everything is performed.

So I believe what you are seeing is where both threads completed stage 1, but only 1 of the threads did stage 2. Which is correct as only 1 thread should do stage 2, but the stage 1 threads already created the collision causing stage 2 saving to save.