When drawing with matplotlib, Japanese causes the text in the image to be a blank grid

### System Info

<img width="1523" height="866" alt="Image" src="https://github.com/user-attachments/assets/c557bc4d-9aaf-4dbd-a6bb-a73df7522e1d" />

### 🐛 Describe the bug

<img width="1523" height="866" alt="Image" src="https://github.com/user-attachments/assets/7e9eb760-0bf7-4447-a77f-55f79404c9f8" />

Is this code generated by an LLM? Where is its prompt word?