This issue is resolved in NSX-T version 3.2.3 available at
VMware downloads.
Workaround:
This issue is resolved in NSX-T 3.2.3, please upgrade to 3.2.3 to avoid this issue.
If you have already encountered this issue, you can create a new Tier-1 gateway used for the service insertion and attach it to the Tier-0 Gateway.
If you believe are experiencing this issue and are unable to create a new Tier-1 Gateway, please open a support request with VMware NSX-T GSS and reference this KB.