valueReference in retrieve referral request (A005, FHIR STU3) in intergration test

I’m trying to parse the results of looking up referral details for ReferralRequest/000000070001 and I’m getting an entry in extension of url https://fhir.nhs.uk/STU3/StructureDefinition/Extension-eRS-Appointment-1' with a valueReference of { reference: 'Appointment/70009' } my understanding was I’d then find an item in contained with a matching id (prefixed with a hash). This is how it works in the retrieve referral worklist (A008, FHIR STU3) API as far as I can see.

Is that not the case ? Is it OK to just ignore missing items ?
In the example below, you can see all the contained results, and there isn’t one for the indicated valueReference

Hi @tc1 - I can’t speak for the FHIR structure here, but I know the appointment details can be fetched via “Retrieve appointment (A038, FHIR STU3)”.

Thanks,
Z.