Expected behavior

When the select rich receives focus screen readers convey it is a combo box.

Actual Behavior

When the select rich receives focus screen readers convey it as a menu button with a submenu

Additional context

According to the documentation the select rich is based on the collapsible dropdown listbox . This pattern has been depracted in favour of the Select-only combobox pattern which has role combobox, mimicking the native select. This is also what I would expect as from a user perspective the select rich bahaves practically the same as a native select.