Description

When using KaTeX in regular Markdown (e.g., inside <p>), both inline \( ... \) and display $$ ... $$ math render correctly.

However, when placing KaTeX expressions inside certain shortcodes such as callout, the formulas are rendered twice:

• once as the properly formatted KaTeX output,
• once as raw LaTeX text.

This results in duplicated math content inside the shortcode blocks.

Steps To Reproduce

Enable KaTeX rendering in the theme.

Create a page with the following content:

Normal paragraph inline math: \(a^2 + b^2 = c^2\).

{{< callout type="info" >}}
Inside callout inline math: \(a^2 + b^2 = c^2\).
{{< /callout >}}

Build and open the site in the browser.

Expected Behavior

Math formulas inside shortcodes should render the same as in normal Markdown paragraphs: only once, using KaTeX formatting.

Actual Behavior

Math formulas inside shortcodes are displayed twice: once as formatted KaTeX output, and again as the raw LaTeX text.

Screenshots

Environment

• Hugo Version: v0.150.0
• Theme Version: v0.11.1

Additional Context

This issue does not occur outside of shortcodes. It seems related to how shortcode templates (e.g., callout.html, details.html) handle inner content combined with KaTeX auto-render or SSR math rendering. Possibly the shortcode outputs both raw content and rendered content, leading to duplication.