Static Route Network CIDR ###.###.##.##/## cannot overlap with IP Space <ip-space-name> internal scope CIDR ###.###.##.##/##Public.This is expected and by design. Creation of Static Routes where the network CIDR overlaps with the Public IP Space is not permitted due to tenancy.
Private IP Space should be used when creating a Static Route on an NSX Edge Gateway where the network overlaps with an IP Space.