Gremlin-go cannot bring out props when querying Vertex with Neptune

g := gremlingo.Traversal_().WithRemote(driverRemoteConnection)
    traversal := g.GetGraphTraversal()

    result, err := traversal.V("v-1").Next()
    vertex, err := result.GetVertex()
    fmt.Println(vertex)

curl --location --request POST 'https://xxx.neptune.amazonaws.com:8182/gremlin' \
--header 'Content-Type: text/plain' \
--data-raw '{"gremlin":"g.V('\''v-1'\'')"}'

{
   
    "result": {
        "data": {
            "@type": "g:List",
            "@value": [
                {
                    "@type": "g:Vertex",
                    "@value": {
                        "id": "v-1",
                        "label": "PERSON",
                        "properties": {
                            "email": [
                                {
                                    "@type": "g:VertexProperty",
                                    "@value": {
                                        "value": "person-1@example.org",
                                        "label": "email"
                                    }
                                }
                            ],
                                }
                            ]
                        }
                    }
                }
            ]
        },
        "meta": {
            "@type": "g:Map",
            "@value": []
        }
    }
}