Repository: angular
Issue: Moving routing animation into parent breaks child sequence order
Labels: type: bug/fix,area: animations,freq2: medium,P3

<!--🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅

Oh hi there! 😄

To expedite issue processing please search open and closed issues before submitting a new one.
Existing issues often contain information about workarounds, resolution, or progress updates.

🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅-->


# 🐞 bug report

### Affected Package
<!-- Can you pin-point one or more @angular/* packages as the source of the bug? -->
<!-- ✍️edit: --> The issue is caused by package @angular/animations


### Is this a regression?

<!-- Did this behavior use to work in the previous version? -->
<!-- ✍️--> Yes, the previous version in which this bug was not present was: Unsure


### Description

<!-- ✍️--> A clear and concise description of the problem...
When moving a routing animation into a parent animation that calls `animateChild()`, child animations are not sequenced anymore.

## 🔬 Minimal Reproduction
<!--
Please create and share minimal reproduction of the issue starting with this template: https://stackblitz.com/fork/angular-issue-repro2
-->
<!-- ✍️-->
Working version :
https://stackblitz.com/github/loicmarie/angular-nested-routing-animation-bug/tree/working
Not working version (with a div wrapper and a parent trigger)
https://stackblitz.com/github/loicmarie/angular-nested-routing-animation-bug/tree/notWorking
<!--
If StackBlitz is not suitable for reproduction of your issue, please create a minimal GitHub repository with the reproduction of the issue.
A good way to make a minimal reproduction is to create a new app via `ng new repro-app` and add the minimum possible code to show the problem. 
Share the link to the repo below along with step-by-step instructions to reproduce the problem, as well as expected and actual behavior.

Issues that don't have enough info and can't be reproduced will be closed.

You can read more about issue submission guidelines here: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#-submitting-an-issue
-->

## 🔥 Exception or Error
<pre><code>
<!-- If the issue is accompanied by an exception or an error, please share it below: -->
<!-- ✍️-->

</code></pre>


## 🌍  Your Environment

**Angular Version:**
<pre><code>
<!-- run `ng version` and paste output below -->
<!-- ✍️-->Angular CLI: 8.3.2
Node: 10.15.3
OS: linux x64
Angular: 8.2.4
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.2
@angular-devkit/build-angular     0.803.2
@angular-devkit/build-optimizer   0.803.2
@angular-devkit/build-webpack     0.803.2
@angular-devkit/core              8.3.2
@angular-devkit/schematics        8.3.2
@angular/cdk                      8.1.4
@angular/cli                      8.3.2
@angular/flex-layout              8.0.0-beta.27
@angular/material                 8.1.4
@ngtools/webpack                  8.3.2
@schematics/angular               8.3.2
@schematics/update                0.803.2
rxjs                              6.5.2
typescript                        3.5.3
webpack                           4.39.2
</code></pre>

**Anything else relevant?**
<!-- ✍️Is this a browser specific issue? If so, please specify the browser and version. -->
In the example, I used flex-layout but the error is still here when using backgroundColor or whatever.
<!-- ✍️Do any of these matter: operating system, IDE, package manager, HTTP server, ...? If so, please mention it below. -->