choicesByUrl are not retrieved when the question is placed inside a Dynamic Panel and sends a parameterized query

[JaneSjs]

T21586 - Issue with Data Retrieval when Changing Element Type
https://surveyjs.answerdesk.io/internal/ticket/details/T21586

---

To reproduce the issue, follow these steps.

• Download this Node.js JSON server app:
  json-test.zip

npm i
npm run start

• Run this demo: View CodeSandbox

A regular panel - when selecting a Group or Car Make, a request is made and Car Model options are retrieved correctly.

In this panel, choices are retrieved as follows:

choicesByUrl: {
  url: 'http://localhost:3000/options/?group={group}&inputs={"car_make": "{bp-param-car_make}"}',
  allowEmptyResponse: true,
  valueName: "name"
}

A dynamic panel - no request is made when selecting options of master questions.

The only difference is that we use {panel.XXX} to reference master field values:

choicesByUrl: {   
     url: 'http://localhost:3000/options/?group={panel.group}&inputs={"car_make": "{panel.bp-param-car_make}"}',
     allowEmptyResponse: true,
     valueName: "name"
}