Inheriting sub-properties with same name is not working

Sub-properties having the same name but belonging to different parents are shadowing each other during the augment process.

Input code

Parent Class code

/**
 * @class ClassA
 * @abstract
 * @since 1.0.0
 * @hideconstructor
 *
 */
class ClassA {
  constructor() { }
  options = {
  /**
   * Prop foo
   * @memberof ClassA
   * @instance
   * @public
   * @type {Object}
   */
  foo: undefined,
    /**
     * Prop foo.a
     *
     * @name foo.a
     * @memberof! ClassA
     * @instance
     * @type {?string}
     * @default null
     */
    /**
     * Prop foo.b
     *
     * @name foo.b
     * @memberof! ClassA
     * @instance
     * @type {?string}
     * @default null
     */
  /**
   * Prop bar
   * @public
   * @memberof ClassA
   * @instance
   * @type {Object}
   * @since 4.1.0
   */
  bar:{
     /**
      * Prop bar.a
      *
      * @name bar.a
      * @memberof! ClassA
      * @instance
      * @type {?string}
      * @default null
      */
      a: {
       /**
        * Prop bar.a.a1
        *
        * @name bar.a.a1
        * @memberof! ClassA
        * @instance
        * @type {?string}
        * @default null
        */
        a1
      },
     /**
      * Prop bar.b
      *
      * @name bar.b
      * @memberof! ClassA
      * @instance
      * @type {?string}
      * @default null
      */
      b: ''
    }
  }
}

Child Class code (extending parent)

/**
 * @class ClassA_Child
 * @augments ClassA
 * @since 1.0.0
 * @hideconstructor
 *
 */
class ClassA {
  constructor() {}
}

JSDoc configuration

Copy the content of the code from above in two separate files in a testcase folder: testcase/classA.js and testcase/classA_child.js. Create the conf.json file in the same folder.

{
    "tags": {
        "allowUnknownTags": true
    },
    "source": {
      "include": ["testcase"],
      "includePattern": ".+\\.js(doc|x)?$",
      "excludePattern": "(^|\\/|\\\\)_"
    },
    "plugins": [],
    "templates": {
        "cleverLinks": false,
        "monospaceLinks": false,
        "default": {
            "outputSourceFiles": true
        }
    }
}

JSDoc debug output

Attached is the generated docs and the tescase with the test files.
run jsdoc: node \node_modules\jsdoc\jsdoc.js -c testcase\conf.json -d docs

Expected behavior

All properties defined on ClassA should be visible and accessible on ClassA_Child
foo
foo.a
foo.b
bar
bar.a
bar.a.a1
bar.b

Current behavior

Because of the overriding/shadowing I only see (in ClassA_Child)
foo
foo.a
foo.b
bar
bara.a1

Your environment

Start by reproducing the issue with testcase/classA.js, testcase/classA_child.js, and testcase/conf.json using the provided JSDoc command. Inspect the augment process responsible for inherited sub-properties with identical names under different parents. Done means ClassA_Child exposes foo, foo.a, foo.b, bar, bar.a, bar.a.a1, and bar.b without shadowing.