`source.pointer` value from publish error response is inconsistent sometimes

Overview

Discovered when testing #3537146: Link Publish errors to the page + component instance that's causing the error. The source the pointer value is sometimes inconsistent. See screenshot below. This the source.pointer starts with model for the first and starts with components for the second.

Steps to reproduce:

1. Create the code component below. Text and link required prop.
2. Click add to components.
3. Add two instances of the component on the page (xb_page).
4. Edit the url prop to be empty on both of the instances that are on the page (Wait for auto-save).
5. Publish the xb_page that the 2 components are on.
6. View publish error response.

Code component used:

uuid: 6c21e124-4d78-408b-8896-1a26a28bcbdc
langcode: en
status: true
dependencies: {  }
machineName: c1
name: c1
required:
  - text
  - url
props:
  text:
    title: text
    type: string
    examples:
      - hello
  url:
    title: url
    type: string
    examples:
      - 'https://www.hello.com'
    format: uri
slots: {  }
js:
  original: |
    // See https://project.pages.drupalcode.org/experience_builder/ for documentation on how to build a code component

    const Component = ({
      text,
      url,
    }) => {
      return (
        <div className="text-3xl">
          {text}
        <br></br>
          {url}
        </div>
      );
    };

    export default Component;
  compiled: |
    // See https://project.pages.drupalcode.org/experience_builder/ for documentation on how to build a code component
    import { jsx as _jsx, jsxs as _jsxs } from "react/jsx-runtime";
    const Component = ({ text, url })=>{
        return /*#__PURE__*/ _jsxs("div", {
            className: "text-3xl",
            children: [
                text,
                /*#__PURE__*/ _jsx("br", {}),
                url
            ]
        });
    };
    export default Component;
css:
  original: ''
  compiled: ''

Proposed resolution

Should be consistent

User interface changes