🐞 bug report

Affected Package

Is this a regression?

Description

Steps to reproduce:

1. Open https://stackblitz.com/edit/angular-lwjmzk
2. Open console (dev console) in stackblitz.
3. Click on link "Go to parent component with items 4, 4, 2". In console will be displayed message from queryParams and queryParamMap observable handlers.
4. Now click on link "Go to parent component with items 4, 3, 2". Now nothing will be printed in console.
5. But reverse will work fine

Expected: Should trigger queryParams observable handler whenever any value changes in query param

🔬 Minimal Reproduction

🌍 Your Environment

Angular Version:

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 9.1.9
Node: 12.1.0
OS: darwin x64

Angular: 9.1.11
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.9
@angular-devkit/build-angular     0.901.9
@angular-devkit/build-optimizer   0.901.9
@angular-devkit/build-webpack     0.901.9
@angular-devkit/core              9.1.9
@angular-devkit/schematics        9.1.9
@angular/cdk                      9.2.4
@angular/cli                      9.1.9
@angular/material                 9.2.4
@ngtools/webpack                  9.1.9
@schematics/angular               9.1.9
@schematics/update                0.901.9
rxjs                              6.5.5
typescript                        3.8.3
webpack                           4.42.0

Anything else relevant?