[BUG] ValueSet $expand doesn't always return a display

[vesnushka]

Describe the bug

ValueSet $expand doesn't always return a display

Severity

Major

Steps to reproduce the behavior:

1. Load terminology http://hl7.org/fhir/ValueSet/yesnodontknow
2. In REST console try GET /ValueSet/yesnodontknow/$expand
   It returns the result with missing display for Y and N code

...
name: Yes-No-Don't-Know
resourceType: ValueSet
expansion:
  timestamp: 2023-06-15T12:35:09.464Z
  identifier: http://hl7.org/fhir/ValueSet/yesnodontknow
  contains:
    - code: 'N'
      system: http://terminology.hl7.org/CodeSystem/v2-0532
    - code: asked-unknown
      system: http://terminology.hl7.org/CodeSystem/data-absent-reason
      display: Don't know
    - code: 'Y'
      system: http://terminology.hl7.org/CodeSystem/v2-0532
...
id: yesnodontknow
url: http://hl7.org/fhir/ValueSet/yesnodontknow
version: 4.0.1
_source: zen.fhir
...

3. Meanwhile trying GET /ValueSet/yesnodontknow in REST console
   returns correct ValueSet with all the displays

...
name: Yes-No-Don't-Know
resourceType: ValueSet
expansion:
  contains:
    - code: 'Y'
      system: http://terminology.hl7.org/CodeSystem/v2-0136
      display: 'Yes'
    - code: 'N'
      system: http://terminology.hl7.org/CodeSystem/v2-0136
      display: 'No'
    - code: asked-unknown
      system: http://terminology.hl7.org/CodeSystem/data-absent-reason
      display: Don't know
  timestamp: '2015-07-14T10:00:00Z'
  identifier: urn:uuid:bf99fe50-2c2b-41ad-bd63-bee6919810b4
...
id: yesnodontknow
url: http://hl7.org/fhir/ValueSet/yesnodontknow
version: 4.0.1
_source: zen.fhir

Expected behavior

Request /ValueSet/yesnodontknow/$expand has to return ValueSet with all the displays

...
name: Yes-No-Don't-Know
resourceType: ValueSet
expansion:
  ...
  contains:
    - code: 'N'
      system: http://terminology.hl7.org/CodeSystem/v2-0532
      display: 'No'
    - code: asked-unknown
      system: http://terminology.hl7.org/CodeSystem/data-absent-reason
      display: Don't know
    - code: 'Y'
      system: http://terminology.hl7.org/CodeSystem/v2-0532
      display: 'Yes'
...

Versions:

• Aidbox image version:

edge
v:2306.9241f01f