A matrix column's Width setting appears empty regardless of the "width" property defined in a survey JSON schema

[JaneSjs]

User Issue: T13796 - Dynamic Matrix Column Width Not Loaded in Creator
https://surveyjs.answerdesk.io/internal/ticket/details/T13796

---

To reproduce the issue, paste the following survey JSON to a survey creator's JSON tab:

{
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "matrixdynamic",
     "name": "question1",
     "columns": [
      {
       "name": "Column 1",
       "width": "400px"
      },
      {
       "name": "Column 2"
      }
     ]
    }
   ]
  }
 ]
}

You can see that the Property grid displays an empty Column's Width property regardless of the "width": "400px" entry in a survey JSON model.