Wondering who's looking after QI Core, found an invariant issue in the Communication Not Done profile
https://build.fhir.org/ig/HL7/fhir-qi-core/StructureDefinition-qicore-communicationnotdone.html#constraints
topic.extension("http://hl7.org/fhir/us/qicore/StructureDefinition/qicore-notDoneValueSet").exists() xor topic.coding.exists()
should be
topic.extension('http://hl7.org/fhir/us/qicore/StructureDefinition/qicore-notDoneValueSet').exists() xor topic.coding.exists()
Single quotes, not double quotes