Files API throwing error when trying to list files

Gemini API
13

I am getting the same error for one particular cloud console project.
Tried a different project and it worked fine.
The message from the @google-genai library is error incredibly unhelpful.
I stepped through with a debugger and was so surprised list files was the issue.

: (in promise) ApiError: {“error”:{“code”:500,“message”:“Failed to convert server response to JSON”,“status”:“INTERNAL”}}
\* The harm category is hate speech.

REST API version:

{
  "error": {
    "code": 500,
    "message": "Failed to convert server response to JSON",
    "status": "INTERNAL"
  }
}

Maybe due to interrupting an upload mid stream leaving the file server in a weird state?
The documentation on what happens behind the scenes is non-existent and the endpoint documentation also is lackluster.
The list files param pageSize gives no sense of what the max is for example.

google.genai.errors.ServerError: 500 INTERNAL