Contains not working as expected with array of objects

[alessio-greco]

Using the following schema:

{
  "$schema": "http://json-schema.org/draft-07/schema",
  "properties": {
    "elements": {
      "type": "array",
      "items": {
        "type": "object"
      },
      "contains": {
        "properties": {
          "somePropertyA": {
            "type": "string",
            "enum": [
              "true"
            ]
          }
        }
      }
    }
  }
}

the following object is considered valid

{
  "elements": [
    {
      "somePropertyB": "false"
    },
    {
      "somePropertyA": "false"
    }
  ]
}

despite the schema saying "elements should contain a "somePropertyA":"true" object.

Is this the normal behaviour? most validators I tried will consider it valid (despite being intended not to be valid). The only way to make this work is passing an array with just the "intended" property, like

{
  "elements": [
    {
      "somePropertyA": "false"
    }
  ]
}

this will correctly be considered invalid.