Transaction: cant delete Observation and DR with "has:"

Describe the bug When sending a transaction to the current hapi jpastarter (5.3.0) hapi changes the order of the request.

{
  "resourceType": "Bundle",
  "type": "transaction",
  "entry": [
    {
      "request": {
        "method": "DELETE",
        "url": "Observation?_has:DiagnosticReport:result:_id=24471"
      }
    },
    {
      "request": {
        "method": "DELETE",
        "url": "/List?code=C115916&subject=5016"
      }
    },
    { "request": { "method": "DELETE", "url": "DiagnosticReport/24471" } }
  ]
}

I expected, that the order of the entries would be the order of execution. But hapi first deletes the DR, and then fails to delete the Observations.

To Reproduce Steps to reproduce the behavior:

see above

Expected behavior HAPI deletes the observations AND the DiagnosticReport

Environment (please complete the following information):

HAPI FHIR Version 5.3.0
JPA Starter Project

hapifhir / hapi-fhir

Transaction: cant delete Observation and DR with "has:" #2501