Commented Unassigned: NuGet official package source is not getting migrated to nuget.org, when there is nugetdefaults.config [3533]

Repro steps:
1. having nuget official feed only on nuget 2.6
2. create a nugetdefaults.config as attached
3. upgrade nuget to 2.7


Expected: The NuGet official package source is migrated to nuget.org


Actual: not migrated


see attached screenshot.
Comments: add screenshot for the feeds, after nuget 2.7 is installed