[Bug] 代码块往下箭头变成横向了的

### 💻 系统环境 | Operating System

Windows

### 🌐 浏览器 | Browser

Chrome

### 🐛 问题描述 | Bug Description

<img width="2100" height="678" alt="Image" src="https://github.com/user-attachments/assets/51b213d6-d487-47dd-82c7-a248be73c0b5" />

### 🚦 期望结果 | Expected Behavior

应该仍然是纵向箭头

### 📷 复现步骤 | Recurrence Steps

_No response_

### 📝 补充信息 | Additional Information

_No response_