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

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.

No source file or test is named. Start by reproducing the issue with the supplied OpenAPI 3.0 snippet in Redoc 2.5.2, then trace the Markdown rendering and sidenav generation paths. Done means bold and italic headers render once with their content and produce correct navigation titles.