[Knockout] Multi-Select Matrix with a checkbox column allows users to select more choices than the specified number of maxSelectedChoices

[JaneSjs]

Usage Scenario: only allow a specific options selected per row for a matrix.
T14484 - Enableif based on selection for Matrix Dropdown Rows
https://surveyjs.answerdesk.io/internal/ticket/details/T14484

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View Demo for React - It works as expected - users cannot select more than 2 options per row.

Related issue: #6866.

View Demo for Knockout - It is still possible to select more than 2 options per row.

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "pg_Q1",
   "elements": [
    {
     "type": "matrixdropdown",
     "name": "Q1",
     "title": "Select up to two products that each statement best represents. ",
     "isRequired": true,
     "validators": [
      {
       "type": "expression",
       "text": "Maximum 2 options per row are allowed",
       "expression": "{Q1.1.insulinTypes.length} <= 2"
      },
      {
       "type": "expression",
       "text": "Maximum 2 options per row are allowed",
       "expression": "{Q1.2.insulinTypes.length} <= 2"
      },
      {
       "type": "expression",
       "text": "Maximum 2 options per row are allowed",
       "expression": "{Q1.3.insulinTypes.length} <= 2"
      },
      {
       "type": "expression",
       "text": "Maximum 2 options per row are allowed",
       "expression": "{Q1.4.insulinTypes.length} <= 2"
      },
      {
       "type": "expression",
       "text": "Maximum 2 options per row are allowed",
       "expression": "{Q1.5.insulinTypes.length} <= 2"
      },
      {
       "type": "expression",
       "text": "Maximum 2 options per row are allowed",
       "expression": "{Q1.6.insulinTypes.length} <= 2"
      }
     ],
     "columns": [
      {
       "name": "insulinTypes",
       "title": "Toujeo",
       "cellType": "checkbox",
       "showInMultipleColumns": true,
       "choices": [
        {
         "value": "toujeo",
         "text": "Toujeo"
        },
        {
         "value": "tresiba",
         "text": "Tresiba"
        },
        {
         "value": "lantus",
         "text": "Lantus"
        },
        {
         "value": "xultophy",
         "text": "Xultophy"
        },
        {
         "value": "novoMix",
         "text": "NovoMix"
        }
       ],
       "maxSelectedChoices": 2
      }
     ],
     "cellType": "checkbox",
     "rows": [
      {
       "value": "1",
       "text": "Is the most affordable injectable diabetes medication"
      },
      {
       "value": "2",
       "text": "Is listed (restricted or un-restricted) in the Diabetes Law"
      },
      {
       "value": "3",
       "text": "Guidelines recommend to use it"
      },
      {
       "value": "4",
       "text": "Is always on the formulary"
      },
      {
       "value": "5",
       "text": "Is a product without restrictions on use"
      },
      {
       "value": "6",
       "text": "Is a product which is always fully reimbursed or with affordable patient co-pay"
      }
     ]
    }
   ]
  }
 ]
}