formatWithCursor and --cursor-offset seem not work

**Prettier-Java 2.6.0**
### Detail
I want to get the index change of given cursor when formatting Java code. I noticed that it can be done with `formatWithCursor`(API) or `--cursor-offset`(CLI). However, whatever valid offset I try, the result will always be 0. Besides, I have also tried with formatting babel code (builtin in Prettier), which behaved correctly. I wonder how I can fix this. Is this a feature unfinished?

I will show you the example with API (CLI also fails extractly the same)
### API Usage with `formatWithCursor`
```js
import * as prettier from "prettier";
import * as prettierPluginJava from "prettier-plugin-java";

const javaText = `
public class HelloWorldExample{public static void main(String args[]){
System.out.println("Hello World !");
}
}
`;

const formattedText = await prettier.formatWithCursor(javaText, {
cursorOffset: 5,
parser: "java",
plugins: [prettierPluginJava.default],
});
```

**Output:**
```java
{
formatted: 'public class HelloWorldExample {\n' +
'\n' +
' public static void main(String args[]) {\n' +
' System.out.println("Hello World !");\n' +
' }\n' +
'}\n',
cursorOffset: 0,
comments: []
}
```

**Expected output:**
```java
{
formatted: 'public class HelloWorldExample {\n' +
'\n' +
' public static void main(String args[]) {\n' +
' System.out.println("Hello World !");\n' +
' }\n' +
'}\n',
cursorOffset: 2,
comments: []
}