Starting with version "4.2.3" the LanguageService fails to be injected into the DialogTitleBarComponent.
This can be easily reproduced in the Single Component Rendering demo.
Link to StackBlitz: https://stackblitz.com/edit/angular-mprlwl?file=app/user-info.component.ts
When opening a dialog with DialogService from an Observable (e.g. in order to initialize dialog with data from a http request) and ChangeDetectionStrategy.OnPush, the dialog is messed up. With ChangeDetectionStrategy.Default everything works fine.
For reproduction have a look to this StackBlitz: https://angular-9vmvyv.stackblitz.io