Bug, feature request, or proposal:
Bug
What is the expected behavior?
When an animation starts after the autocomplete dropdown has opened, the list should stick to the autocomplete input field.
What is the current behavior?
The list does not stick to the input field.
What are the steps to reproduce?
https://stackblitz.com/edit/angular-dgvxco

Which versions of Angular, Material, OS, TypeScript, browsers are affected?
Angular 6.1.1
Material 6.4.2