Unity waapi timeout error

Question

I'm trying to create an event using Waapi from a C# function in Unity.
It seemingly works, I can see the new event in wwise, but I immediately get this error in the unity log. 

TimeoutException: Timeout when receiving message.
Wamp.Receive (System.Int32 timeout) (at Assets/Wwise/API/Runtime/Handwritten/WAAPI/Wamp.cs:334)

This seemingly breaks the connection with wwise. After this I can't post any more waapi events and the wise picker is broken until I restart Unity.
Below is my API call and jsonQuery

AkWaapiUtilities.WaapiClient.Call(
ak.wwise.core.@object.create,
jsonQuery, null);

where jsonQuery is:
{
  "parent": "\\Events\\Default Work Unit",
  "type": "Folder",
  "name": "E04S06",
  "onNameConflict": "merge",
  "children": [
    {
      "type": "Event",
      "name": "E04S06_ENTROO_SERGEANT_002000",
      "children": [
        {
          "name":  "",
          "type": "Action",
          "@ActionType": 1,
          "@Target": "\\Actor-Mixer Hierarchy\\VO Work Unit\\VO Sounds\\E04S06_ENTROO_SERGEANT_0020"
        }
      ]
    }
  ]
}