Expansion panel + Sidenav + Router Active Not working

[keatkeat87]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

when page load, the routerLinkActive.isActive should let expand-panel open.

What is the current behavior?

expand-panel not open.

What are the steps to reproduce?

i m sorry, i try StackBlitz import from github, but run into error. please git clone
https://github.com/keatkeat87/angular-material-expansion-panel-router-active-sidenav
the main code is in product.component.html

What is the use-case or motivation for changing an existing behavior?

this is a common control panel ui request.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 7.0.4
Material 7.0.4
Typescript 3.1.6
Windows 10
Chrome 70

Is there anything else we should know?

if i remove the sidenav, only expand panel + router active, it work perfect.

[josephperrott]

Closing as duplicate of #13870

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