[BUG] Parse similar attributes with underline

### 问题描述
[https://github.com/alibaba/fastjson/issues/1089](url) ，fastjson兼容依旧存在此问题。

### 环境信息
- OS信息： [MacOS 12.7.4 M1 Pro 16 GB]
- JDK信息： [Openjdk 17.0.6]
- 版本信息：[Fastjson 2.0.51]

### 重现步骤

```java

import com.alibaba.fastjson.JSON;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

/**
* Created by wenshao on 20/03/2017.
*/
public class Issue1089 {
@Test
public void test_for_issue() throws Exception {
String json = "{\"ab\":123,\"a_b\":456}";
TestBean tb = JSON.parseObject(json, TestBean.class);
assertEquals(123, tb.getAb());
}

public static class TestBean {
private int ab;

public int getAb() {
return ab;
}

public void setAb(int ab) {
this.ab = ab;
}
}
}
```

### 相关日志输出
Expected :123
Actual :456

Start from the JSON.parseObject call in the Issue1089 reproduction and inspect the deserialization path for TestBean when both "ab" and "a_b" are present. Add or adapt a regression test using the shown JSON and verify that the bean keeps ab=123 rather than assigning 456.

Written by the indexing model from the issue text.