[ BUILD # : 03c621343d68 ]
[ JDK VERSION : 1.6.20 ]

To reproduce it do as follow:
1. Create a new Java project;
2. Create a class as follow
public class Main {
    private String abc;
    public String getAbc() {
        return abc;
    }
    public void setAbc(String abc) {
        this.abc = abc;
    }
}
3. Call Refactor > Extract Superclass... and select all methods and confirm;

The problem is that abc field is not moved. And if the field is used it should
be moved with the protected modifier.