Dropdown simultaneously displays predefined choices and auto-generated items

[JaneSjs]

If you create a Dropdown question in a creator, it has some preconfigured choices.

Now, if you specify the min and max values for auto-generated items:

A Dropdown will display preconfigured and auto-generated items.

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "dropdown",
     "name": "question1",
     "choices": [
      "Item 1",
      "Item 2",
      "Item 3"
     ],
     "choicesMin": 1,
     "choicesMax": 10
    }
   ]
  }
 ]
}

Is it the expected behavior?

[JaneSjs]

Solution: manually remove the preconfigured items and keep only auto-generated ones.

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "dropdown",
     "name": "question1",
     "choicesMin": 1,
     "choicesMax": 10
    }
   ]
  }
 ]
}