@Joey tree which i get from the NodeJS API calls is not exactly the same as the tree, which Golang code is parsing. Golang traverses the tree using

treeNode.Expanded

and NodeJS does not have it. Instead, JSON object that I got from the JavaScript SDK has:

"expandedRelation":"read",
    "expandedObject":{
      "objectType":"event",
      "objectId":"12"
    }