Groovy3 CompileStatic bug: Method clone is protected in java.lang.Object

package a.b.c

import groovy.transform.CompileStatic

@CompileStatic
class ABC implements DEF {
    public double[] _array

    ABC() { }

    DEF clone() {
        ABC abc = (ABC) super.clone()
        abc._array = _array.clone() as double[]
        return abc
    }
}

public interface DEF extends Cloneable {
    public DEF clone() throws CloneNotSupportedException;
}
 

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
ABC.groovy: 15: Method clone is protected in java.lang.Object @ line 15, column 22.
           abc._array = _array.clone() as double[]
                        ^

1 error