VMware Released NSX Data Center for vSphere 6.4.8 to replace 6.4.7 due to a bug which you can read more about here.
Resolved Issues in 6.4.8
- Fixed Issue 2614777: DFW Rule Publish fails if a rule is comprised of two services with overlapping service port/range of service ports.DFW rule publish fails.
VMware NSX Data Center for vSphere 6.4.8 Release Notes