Hi, we've noticed an issue when attempting to load bundles with

AllergyIntolerance.category

set to

[null]

and a

dataAbsentReason

specified on `_category`:

"category": [
    null
  ],
  "_category": [
    {
      "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/data-absent-reason",
      "valueCode": "unsupported"
    }
  ]

When calling POST /fhir/R4, we get the error:

{
  "resourceType": "OperationOutcome",
  "issue": [
    {
      "severity": "error",
      "code": "invalid",
      "details": {
        "text": "Cannot convert undefined or null to object"
      }
    }
  ],
  "extension": [
    {
      "url": "https://medplum.com/fhir/StructureDefinition/tracing",
      "extension": [
        {
          "url": "requestId",
          "valueUuid": "67ab9aea-2d81-4130-9007-7214ff0e0bc9"
        },
        {
          "url": "traceId",
          "valueUuid": "0da18d9f-8160-43a8-9240-62cefcff64bc"
        }
      ]
    }
  ]
}

This error seems to be coming from `rewriteIdsInObject`https://github.com/medplum/medplum/blob/3447ea303994e4584333f7a50b2f8fc57579d21c/packages/fhir-router/src/batch.ts#L201 However, when calling POST /fhir/R4/Bundle/$validate for the same Bundle, we get the

All OK

response with no errors. Could you help me understand why this would occur? Is it expected for Medplum to be able to load a resource that's formatted like this?

HI @exquisite_hamster_10635 , I jsut confirmed with the team that this is indeed valid FHIR, and a bug in the batch processor. I've filed a ticket to fix here: https://github.com/medplum/medplum/issues/3580

@rahul1 Thanks for fixing that so quickly!