Matches multiple schemas when only one must validate

Question

I have complex json-schema file for validating configuration files for ansible. Below is short part with problem that I have. I'm not clear why "test 2" is not working (not properly matched against json-schema).
Based on this doc (https://json-schema.org/understanding-json-schema/reference/combining.html), oneOf=XOR, anyOf=OR, but my tests are not working.

I'm using vscode-yaml v0.23 (because v1.0.0 has an issue with autocompletion)

json-schema file:

{
  "oneOf": [{ "$ref": "#/$defs/objectA" }, { "$ref": "#/$defs/objectB" }],

  "$defs": {
    "objectA": {
      "type": "object",
      "title": "Object A",
      "properties": {
        "objA": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "name": { "$ref": "#/$defs/name" },
              "color": { "type": "string", "description": "color" }
            },
            "required": ["name"],
            "additionalProperties": false
          }
        }
      }
    },
    "objectB": {
      "type": "object",
      "title": "Object B",
      "properties": {
        "objB": {
          "type": "object",
          "properties": {
            "name": { "$ref": "#/$defs/name" },
            "size": { "type": "string", "description": "size" }
          },
          "required": ["name", "size"],
          "additionalProperties": false
        }
      }
    },
    "name": {
      "$comment": "this is common property for objA and objB",
      "name": { "type": "string", "description": "name" }
    }
  }
}

First test

test 1

this file is not valid.
error: "Matches multiple schemas when only one must validate."
reason: (from my point of view) because match rule is set to "oneOf" and in this configuration is matched multiple rules.

objA:
  - name: testA1
    color: red
  - name: testA2

objB:
  size: middle
  name: nameB

test 2

error: the same error as before

But it's not clear for me... match rule is 'oneOf', yaml config is changed that only one valid configuration is there (for object A) but validation ends with error. The question is, why is matched multiple schemas, when only one (object A) is configured (and matched from my point of view).

objA:
  - name: testA1
    color: red
  - name: testA2

Another test

When I change oneOf to anyOf:
"anyOf": [{ "$ref": "#/$defs/objectA" }, { "$ref": "#/$defs/objectB" }]

This config file IS valid (it's wrong, becasue 'objB' is missing required parameter 'name'):

objA:
  - name: testA1
    color: red
  - name: testA2

objB:
  size: middle

Can anybody explain me where is the problem?

thx, martin

Reproduce the supplied schema and YAML examples using vscode-yaml v0.23, beginning with test 1 and test 2. Compare how oneOf, anyOf, and the referenced definitions are evaluated; done means determining whether the validator has a defect and documenting a precise, reproducible result or required project change.