Math formulas are not rendered correctly.

Math formulas are not rendered correctly. Example output: [

P_{\mathrm{heat}} = I_{\mathrm{rms}}^2 R_{\mathrm{loss}}

]

---
| Field | Value |
| --- | --- |
| App version | 1.1.9 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Day 1 |

Start by reproducing the rendering problem in the /chat path using the reported formula and the GitHub theme on Windows 10.0.26200 with app version 1.1.9. Done means the displayed formula preserves the intended mathematical notation instead of showing incorrect output.

索引モデルが issue の本文から書いたものです。