mongodb endpoint server error when trying to retrieve all documents but not when retrieving one document in collection

Question

I have created the following function in mongodb atlas:

// This function is the endpoint's request handler.
exports = function({ query, headers, body}, response) {
    // Data can be extracted from the request as follows:
    const docs = context.services
    .get("mongodb-atlas")
    .db("tennisRankings")
    .collection("UTR14Female")
    .find({utr: {$exists:true}})
    .toArray();
    return docs
};

This is paired up with an Mongo Atlas endpoint. I receive the following error when I request:

HTTP/1.1 500 Internal Server Error
content-encoding: gzip
content-type: application/json
strict-transport-security: max-age=31536000; includeSubdomains;
vary: Origin
x-appservices-request-id: 6467707e967219ab3bf8ce7e
x-envoy-max-retries: 0
x-frame-options: DENY
date: Fri, 19 May 2023 12:50:06 GMT
content-length: 189
x-envoy-upstream-service-time: 164
server: mdbws
connection: close

{
  "error": "error processing request",
  "error_code": "InternalServerError",
  "link": "https://realm.mongodb.com/groups/64620fa04a4f24495a3299fd/apps/6466ca1190b5521afdd68636/logs?co_id=6467707e967219ab3bf8ce7e"
}

However, when I change the find() to findOne(), I retrieve the first record successfully. The working code is below:

// This function is the endpoint's request handler.
exports = function({ query, headers, body}, response) {
    // Data can be extracted from the request as follows:
    const docs = context.services
    .get("mongodb-atlas")
    .db("tennisRankings")
    .collection("UTR14Female")
    .findOne()
    return docs;
};

I have also tried:

.find({})

The linked error log output is below:

Error:


failed to set response

{
  "name": "getUTR",
  "arguments": [
    {
      "query": {},
      "headers": {
        "X-Cluster-Client-Ip": [
          "114.77.49.60"
        ],
        "X-Forwarded-Proto": [
          "https"
        ],
        "X-Forwarded-Client-Cert": [
          "By=spiffe://xgen-prod/ns/baas-prod/sa/baas-main;Hash=c68c5aa61293af7317ce95a81111deb355d7f6acdfabeb775e95a468d14f947a;Subject=\"O=MongoDB\\, Inc.,CN=lb-b\";URI=spiffe://xgen-prod/ns/vm-prod/sa/lb-b"
        ],
        "X-Forwarded-For": [
          "114.77.49.60"
        ],
        "X-Envoy-External-Address": [
          "114.77.49.60"
        ],
        "X-Request-Id": [
          "f0453022-268c-448d-8056-72b54252fce4"
        ],
        "Postman-Token": [
          "8c57ce45-12c6-47bf-a476-c5588c9d29ff"
        ]
      }
    },
    {}
  ]
}
Function Call Location:

AU

Endpoint Query Arguments:

{}
Endpoint Headers:

{
  "X-Forwarded-Proto": [
    "https"
  ],
  "X-Forwarded-Client-Cert": [
    "By=spiffe://xgen-prod/ns/baas-prod/sa/baas-main;Hash=c68c5aa61293af7317ce95a81111deb355d7f6acdfabeb775e95a468d14f947a;Subject=\"O=MongoDB\\, Inc.,CN=lb-b\";URI=spiffe://xgen-prod/ns/vm-prod/sa/lb-b"
  ],
  "X-Forwarded-For": [
    "114.77.49.60"
  ],
  "X-Envoy-External-Address": [
    "114.77.49.60"
  ],
  "X-Request-Id": [
    "f0453022-268c-448d-8056-72b54252fce4"
  ],
  "Postman-Token": [
    "8c57ce45-12c6-47bf-a476-c5588c9d29ff"
  ],
  "X-Cluster-Client-Ip": [
    "114.77.49.60"
  ]
}

Any assistance is appreciated.