Randomizing questions on a page doesn't work when the survey is in question-per-page mode

[SamMousa]

Describe the bug
Random question order no longer works in questionPerPageMode.

I get the technical cause of this, ie. you no longer make pages on the fly. But this significantly changes behavior.
Up until 1.12.15 the questionPerPageMode didn't fundamentally change behavior; since 1.12.16 it does.

{
  "pages": [
    {
      "name": "page1",
      "questionsOrder": "random",
      "elements": [
        {
          "type": "radiogroup",
          "name": "question1",
          "choices": [
            "Item 1",
            "Item 2",
            "Item 3"
          ]
        },
        {
          "type": "checkbox",
          "name": "question2",
          "choices": [
            "Item 1",
            "Item 2",
            "Item 3"
          ]
        },
        {
          "type": "dropdown",
          "name": "question3",
          "choices": [
            "Item 1",
            "Item 2",
            "Item 3"
          ]
        }
      ]
    }
  ],
  "questionsOnPageMode": "questionPerPage",
}

This json does not behave the same between 1.12.15 and 1.12.16.