[BUG] PropertyNamingStrategy does not apply when deserializing JSON string into an Object

### 问题描述
*简要描述您碰到的问题。*

When serializing and deserializing I use the PropertyNamingStrategy (for example, LowerCaseWithUnderScores). It works fine when serializing Object to Json string. But when deserializing from a Json string to an Object, it does not work.

### 环境信息
*请填写以下信息：*

- OS信息：MacOS 14.4.1, Apple M1 Pro, 32Gb
- JDK信息： openjdk 21.0.2 2024-01-16 LTS
- 版本信息：FastJson 2.0.49

### 重现步骤
*如何操作可以重现该问题：*

```java
import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.PropertyNamingStrategy;
import com.alibaba.fastjson2.filter.NameFilter;
import org.junit.jupiter.api.Test;

public class FastJsonSerializationTest {
@Test
public void jsonFastSerializationTest() {
var namingStrategy = NameFilter.of(PropertyNamingStrategy.LowerCaseWithUnderScores);

var user = new User(123L, "First", "Last");

var userAsJsonString = JSON.toJSONString(user, namingStrategy);

System.out.println(userAsJsonString); // {"first_name":"First","id":123,"last_name":"Last"} -> Ok

var deserializedUser = JSON.parseObject(userAsJsonString, User.class, namingStrategy);

System.out.println(deserializedUser); // UserTest{id=123, firstName='null', lastName='null'} -> Bug!!!
}

public static class User {
private Long id;
private String firstName;
private String lastName;

public User(Long id, String firstName, String lastName) {
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
}

public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

public String getFirstName() {
return firstName;
}

public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String getLastName() {
return lastName;
}

public void setLastName(String lastName) {
this.lastName = lastName;
}

@Override
public String toString() {
return "UserTest{" +
"id=" + id +
", firstName='" + firstName + '\'' +
", lastName='" + lastName + '\'' +
'}';
}
}
}
```

### 期待的正确结果
*对您期望发生的结果进行清晰简洁的描述。*

The naming strategy should work both ways (serialization/deserialization)