This issue is resolved in VMware NSX for vSphere 6.3.6
Workaround:
Important: Upgrading from NSX 6.2.0, 6.2.1 and 6.2.2 directly to NSX 6.3.5 and later versions including 6.4.x is not supported.
If you have already encountered this issue:
Important: Always take a backup of the NSX Manager before proceeding with an upgrade.
After the NSX Manager is restored, upgrade it to any of the version between 6.2.4 to 6.3.4 and then upgrade to NSX for vSphere 6.3.5. VMware recommends upgrading to the latest version of 6.2.x which is 6.2.9 and then upgrade to 6.3.5. Once the NSX Manager is upgraded to 6.3.5, upgrade all the services.
Upgrade Steps:
For more information, see the VMware Product Interoperability Matrices for the supported upgrade paths to NSX for vSphere.