[BUG]2.0.54版本，使用parseObject(String text, Class<T> clazz)方法导致OOM

### 问题描述
parseObject生成大量值为null的对象，导致内存突然之间飚高，最终OOM

### 环境信息
*请填写以下信息：*

- OS信息： [e.g.：CentOS 8.4.2105 4Core 3.10GHz 16 GB]
- JDK信息： [e.g.：Openjdk 21.xxx]
- 版本信息：[e.g.：Fastjson2 2.0.54]

### 重现步骤
*如何操作可以重现该问题：*
执行如下代码可以复现
```java
@Getter
@Setter
public class User {
private List schools;

public static void main(String[] args) throws JsonProcessingException {
User entity = JSON.parseObject("{\"schools\":[{nu}]}", User.class, JSONReader.Feature.IgnoreNullPropertyValue);
System.out.println(entity);
}

@Getter
@Setter
static class School {
private String name;
}
}

```

### 期待的正确结果
*不OOM*

### 相关日志输出
*请复制并粘贴任何相关的日志输出。*

#### 附加信息

Start with the provided User/School reproducer and trace JSON.parseObject(String, Class, JSONReader.Feature.IgnoreNullPropertyValue), focusing on the schools list and malformed null values. Confirm the behavior with a focused regression test; done means parsing the input no longer creates unbounded null-valued objects or causes OOM.

Written by the indexing model from the issue text.