Required fields in a Set within a custom Layout Component

Support
1

I have a custom Layout Component, which contains a Repeater field which has a Set as it’s type that is repeated. What I cannot get to work is setting required fields within this Set.
I know, that I need to set the “required” value into a nested options element, but it still does not work:

{
  "field": {
    "type": "set",
    "options": {
      "fields": [
        {
          "name": "title",
          "type": "text",
          "options": {
            "required": true
          }
        }, ...
      ]
    }
  }
}

This does not fail during saving when the title is not set. I assume, that the conditions within the Layout Component are not validated during saving of the Collection entry?

Thanks for clarification.