Expected parameter of type XXX but got YYY static compile error

@CompileStatic
class Test {
  List<Foo> foo() {
    return []
  }

  List<String> bar() {
    return foo().collect { Foo it -> it.instanceId }
  }
}

@CompileStatic
class Foo {
  String instanceId
}

Test.groovy: 36: Expected parameter of type java.lang.String but got nextflow.Foo

@ line 36, column 32.

           return foo().collect { Foo it -> it.instanceId }

                                  ^

Test.groovy: 36: [Static type checking] - No such property: instanceId for class: java.lang.String

@ line 36, column 42.

   urn foo().collect { Foo it -> it.instanc