valueBoolean attribute from extensions gets deleted

[alexdefelipe]

I've got a questionnaire in a FHIR Server with the extension that enables the observationExtract mechanism:

"extension": [
    {
      "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-observationExtract",
      "valueBoolean": true
    }
  ]

When importing it through the formbuilder, the property valueBoolean gets cleared and, if saving again to the FHIR server, the observationExtract mechanism won't work:

"extension": [
    {
      "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-observationExtract"
    }
  ]