cdk-describedby-message-container appears twice with SSR / Angular Universal

[Trysor]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

For cdk-describedby-message-container to appear only once in DOM

What is the current behavior?

It appears twice; appears first in the SSR-rendered output by Angular Universal, and then again after the SPA has fully loaded.

What are the steps to reproduce?

1. Create an Angular Universal application with material / CDK
2. Create component which causes describedby messages to be created
3. Launch the Universal application

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

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

Angular CLI: 6.1.0-rc.0
Node: 10.2.1
OS: win32 x64
Angular: 6.1.0-beta.1

angular-devkit 0.7.0-rc.0
angular/cdk 6.2.1
angular/material 6.2.1
ngtools/webpack 6.1.0-rc.0
schematics/angular 0.7.0-rc.0
schematics/update 0.7.0-rc.0
rxjs 6.2.1
typescript 2.7.2
webpack 4.9.2

nguniversal/common 6.0.0
nguniversal/express-engine 6.0.0
nguniversal/module-map-ngfactory-loader 6.0.0

Is there anything else we should know?

[ericel]

I have the same behavior on my universal build. The Dialog box shows twice as seen here:

What would be the work around?