Formatter changes/deletes my code

I have the following code

class A {
    String get(Client a) {
        return "AC";
    }
}

class B extends A {
    String get(SpecialClient a) {
        return "BS";
    }
}

class C extends B {
} 
    
    
    

    
        
            

        

      
    

    



    

    

I am keeping all the white spaces here in case they could affect the behavior of the formatter.
With the code above, when I try to save in VS Code (I have turned on formatOnSave), the code becomes

class A {
    String get(Client a) {
        return "AC";
    }
}

class B extends A {
    String get(SpecialClient a) {
        return "BS";
    }
}

class C}

            

    
    
    

    

    
        

    

    
        
    

 

         

     

    



      

    
        

or

class A {
    String get(Client a) {
        return "AC";
    }
}

class B extends A {
    String get(SpecialClient a) {
        return "BS";
    }
}


    class
    C extends
    B {
    
    

    
    
    
     

    
    


    
    
        

        
        
     



    

    

Actually, the code changes to something slightly different every time I tried to reproduce this problem.
This is certainly not the first time I encountered this issue, but since I am not a Java developer, I was not quite bothered by this funny bug.

All java-related extensions I installed are Maven for Java, Debugger for Java, Language Support for Java(TM) by Red Hat, Language Extension Pack, and Java Dependency Viewer.

P.S. I didn't quite remember installing the extensions above, it could be the default extensions installed by VS Code when I wrote my first java file there?