NSX Global-manager UI is reporting the incorrect number of segments within the Network Overview Tab (under Segments).
No operational impact, it's a cosmetic UI behavior.
Based on the corfu data, there is a presence of Global DVPGs in the environment. Since DVPGs are not supported on Federation GM (and also this cannot be viewed on Federation GM UI), the Segment table in corfu does not get populated with the DVPG data.
Fixed in 4.2.1