bug(Menu): menu open animation lost after first click

[nzbin]

Reproduction

https://material.angular.io/components/menu/examples

Steps to reproduce:

1. Click button to open menu
2. Click again

Expected Behavior

The menu always has open animation.

Actual Behavior

The menu open animation lost after first click.

Environment

• Angular: 10+
• CDK/Material: 10+
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu):

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}