Math equations and callout blocks not rendering in published articles

Description:

**Math equations** and **callout blocks** are not rendering correctly in published articles,
they appear as raw code instead of rendered content.

In the **editor**, math and callouts display correctly.

Additionally, the **“Copy draft preview URL”** feature returns a **404 page** instead of showing the draft preview.

Notes:
The issues appeared after a recent hashnode update.

先重現包含數學方程式和 callout 區塊的已發布文章的呈現問題，然後測試「Copy draft preview URL」流程。當兩種內容類型都能正常呈現而不是顯示為原始程式碼，且複製的草稿預覽 URL 不再返回 404 頁面時，即表示完成。

由索引模型根據 Issue 內容生成。