Validating Network Topology service(validateNetworkTopology) The index already exists. Trace Network

[PeriklisPanagiotidis]

I have a trace network that I can edit via custom widgets in the EXB. The edits produce dirty areas which I am trying to validate through the API. But I am getting this error. Any idea what I am hitting here? Can't find any information about this.

{
 "success": false,
 "error": {
  "extendedCode": -2147219630,
  "message": "The index already exists.",
  "details": [
   
  ]
 }
}

When I open the Trace Network item from the portal in Arcgis Pro, the validation works fine. I attach the debug server logs.

I am in Arcgis Enterprise 12.0

Postgresql Enterprise GDB.