Empty value on production build

Hello. I'm trying to get selector value and use it in my component class, but on production annotations[0].selector is empty.

import { Directive, ElementRef, AfterContentInit } from '@angular/core';

@Directive({
  selector: '[appLinkedCheckbox]'
})
export class LinkedCheckboxDirective implements AfterContentInit {
  private el: HTMLElement;

  constructor(el: ElementRef) {
    this.el = el.nativeElement;
  }

  public ngAfterContentInit() {
    let annotations = Reflect.getMetadata('annotations', this.constructor);
    let selector    = annotations[0].selector;  // This value is empty on production build
  }
}

@angular/cli: 1.0.0-rc.0
node: 7.7.4
os: darwin x64
@angular/common: 2.4.10
@angular/compiler: 2.4.10
@angular/core: 2.4.10
@angular/forms: 2.4.10
@angular/http: 2.4.10
@angular/platform-browser: 2.4.10
@angular/platform-browser-dynamic: 2.4.10
@angular/platform-server: 2.4.10
@angular/router: 3.4.10
@angular/compiler-cli: 2.4.10
@angular/cli: 1.0.0-rc.0

Start by reproducing the reported difference between development and production builds around Reflect.getMetadata('annotations', this.constructor). Compare the selector value from the shown Angular directive in both builds and determine whether the metadata remains available. Done means the production build behavior is explained and the selector is consistently retrievable or the limitation is documented.