#### What is the expected behavior? Expansion panel is opened by mouse click #### What is the current behavior? Expansion panel cannot be opened #### What are the steps to reproduce? Here is a reproduction. Try opening first panel. https://stackblitz.com/edit/angular-13oq4e #### Which versions of Angular, Material, OS, TypeScript, browsers are affected? Angular 7.2.15 Angular Material 7.3.7 Latest Chrome and Firefox browsers are affected #### Is there anything else we should know? Please see stackblitz reproduction. I beleive this is the same issue described here: https://github.com/angular/components/issues/11765#issuecomment-465404702