🐛[BUG] Schema Form 的列表模式在第二条开始后Title不再显示

提问前先看看：

https://github.com/ryanhanwu/How-To-Ask-Questions-The-Smart-Way/blob/main/README-zh_CN.md

### 🐛 bug 描述

Schema Form 的列表模式在第二条开始后Title不再显示，如图：


### 📷 复现步骤

https://codesandbox.io/p/sandbox/43ggfj

### 🏞 期望结果

每一条都显示标题

### 💻 复现代码

https://codesandbox.io/p/sandbox/43ggfj

### © 版本信息

- ProComponents 版本:2.8.6

### 🚑 其他信息

Start with the linked CodeSandbox reproduction and inspect the Schema Form list-mode configuration that causes titles to disappear from the second item onward. Compare the rendered labels with the expected result, then verify that every list entry displays its title using ProComponents 2.8.6 behavior as the baseline.

Written by the indexing model from the issue text.