bug(mat-select): Mat select arrow is not rotating when the dropdown menu is visible

[bogdandevlpr]

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

Currently the mat-select dropdown arrow is not rotating when the select dropdown is visible.
But according to the material design, it should change direction when the menu is opened.

Material design: https://m2.material.io/components/menus#exposed-dropdown-menu

Reproduction

You can see the issue in action on any select field: https://material.angular.io/components/select/examples

Expected Behavior

The arrow should rotate/change direction when the dropdown menu is visible

Actual Behavior

The arrow is not rotating/changing direction when the dropdown menu is visible

Environment

• Angular: 18
• CDK/Material: 18
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows