DropdownMenu is not accessible

[PetzeltA]

Bug Report

Steps

Create a Menu with a simple MenuItem and a Dropdown with a DropdownMenu and some DropdownItem-Elements.
Use Keyboard to navigate to the Dropdown and try to navigate within the DropdownMenu by using just the keyboard

Expected Result

Keyboard navigation works

Actual Result

You cannot navigate with a keyboard💣

Version

2.1.5 and latest beta

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