Markdown headers in OpenApi description not rendered properly when using italic/bold in headers

[MariusCorbiere]

Describe the bug
Markdown headers in OpenApi description field is not rendered properly when using italic or bold text. Headers are displayed twice, first with html tags visible and without the content, then properly. The sidenav shows only the malformatted titles, it breaks the navigation within the OpenApi specification.

Expected behavior
Headers should be displayed only once, properly formatted with the content under it, even if bold or italic text is used. Navigation with sidenav should work.

Minimal reproducible OpenAPI snippet(if possible)

{
  "openapi": "3.0.0",
  "info": {
    "version": "1.0.0",
    "title": "Example spec",
    "description": "# Header 1\n\n## Header 1.1 with **bold**\nSome content in section 1.1\n\n## Header 1.2 with _italic_\n Some more content in section 1.2"
  }
}

Screenshots
Here is the result after rendering

Additional context
I am using Redoc 2.5.2 in an Angular application.
The rendering is good if italic/bold is not used in headers.