bug(menu): options fail to load in some cases

[mmalerba]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

Originally reported in yaqs/4083686241118191616

I have a nested menus that need to lazily load. Some of those menu options has submenu and som don't. If I move the cursor fast, submenus can't be rendered.

Reproduction

StackBlitz link: https://stackblitz.com/edit/3qshghrq?file=src%2Fexample%2Fmenu-overview-example.html
Steps to reproduce:

1. Open menu
2. Move mouse quickly across the options until one of the submenus loads with no options rendered

Expected Behavior

Submenus always have options rendered

Actual Behavior

Submenus do not always have options rendered

Environment

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