Menu with matMenuContent breaks hover behaviour

[Harpush]

Reproduction

https://stackblitz.com/edit/angular-nzsa6j?file=app/nested-menu-example.html

Steps to reproduce:

1. Open the menu and quickly hover on items... more than one item will be styled as hovered while doing so and even after at some scenarios.
   It only happens for menu items with trigger it seems

Expected Behavior

What behavior were you expecting to see?
The hover functionality should work the same as without the matMenuContent

Actual Behavior

What behavior did you actually see?
The hover functionality isn't working as expected and highlighting more than one element (even with slight delay it seems)

Environment

• Angular: 8.2.4
• CDK/Material: 8.1.4
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

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