Custom composite question: A newly added dynamic panel disappears when modifying another question's value

[JaneSjs]

T19145 - The dynamic panel will be cleared.
https://surveyjs.answerdesk.io/internal/ticket/details/T19145

---

Consider the following composite question definition.
View Demo

Survey.ComponentCollection.Instance.add({
    name: 'customQuestion',
    title: 'Custom Composite',
    elementsJSON: [
        {
            type: 'boolean',
            name: 'isCompleted',
        },
        {
          "type": "paneldynamic",
          "name": "question1",
          "templateElements": [
            {
              "type": "text",
              "name": "question2"
            }
          ]
        }
    ],
});

To reproduce the issue, add a new dynamic panel; do not fill question answers. Change a Boolean question's value. You'll see that a newly added dynamic panel disappears. However, if you fill in a dynamic panel's field value, it will remain after updating a Boolean question.

2024-07-25_13-19-28.mp4