Static type checking fails when compiling against a Java8 interface with inherited methods

interface I {
    R[] method();
}

interface I2 extends I {
    R2[] method();
}

interface R {}
interface R2 extends R {}

import groovy.transform.CompileStatic

@CompileStatic
class Gr {
    R2[] x(I2 i) {
       return i.method();
    }
}

usage.groovy: 6: [Static type checking] - Reference to method is ambiguous. Cannot choose between [R2[] I2#method(), R[] I2#method()]
 @ line 6, column 15.
          return i.method();
                 ^

1 error