The document in question: [doc_image.pdf](https://github.com/mozilla/pdf.js/files/6896539/doc_image.pdf)

Configuration:
- Web browser - Chrome
- Operating system and its version: Windows 10
- PDF.js version: 2.8.335, 2.10.377
- Is a browser extension: no

Expected document rendering:
![image](https://user-images.githubusercontent.com/54116291/127397691-77d8983f-f480-42e9-bd70-d865b8031576.png)

Actual rendering with an error
![image](https://user-images.githubusercontent.com/54116291/127398116-59fc45e9-e961-4fd3-add7-563299d32c65.png)
![image](https://user-images.githubusercontent.com/54116291/127397832-fd524736-e1fd-40e5-a783-7ed025f332eb.png)

return true;
    }
    warn(`Unknown group type ${group.type}.`);
    return true;
  }
  setVisibility(id, visible = true) {
    if (!this._groups.has(id)) {
      warn(`Optional content group not found: ${id}`);
      return;
    }
    this._groups.get(id).visible = !!visible;
  }
  getOrder() {
    if (!this._groups.size) {
      return null;
    }
    if (this._order) {
      return this._order.slice();
    }
    return Array.from(this._groups.keys());
  }
  getGroups() {
    return this._groups.size > 0 ? objectFromMap(this._groups) : null;
  }
  getGroup(id) {
    return this._groups.get(id) || null;
  }
}
export { OptionalContentConfig };