When creating a cluster to cluster live migration plan, on both the "Network Map" and "Storage Map" configuration pages, if you select "Use new network map", the pull down selector for the "Source network" does not show/populate any information under the "Network used by the selected VMs" section. Please see the attached image for additional information 

MTV 2.10 pre-release, OCP 4.20.0, CNV 4.20

Always 

1.Create a cluster to cluster live migration plan
2. when you get to the "network map" section, select "Use new network map"
3.select the Source Network drop down, you will see that the section titles "Networks used by the selected VMs" is blank. This should be populated.

Networks used by the selected VMs is blank

Networks used by the selected VMs should be populated