All devices dropdown is clickable and does not show any options when no additional devices are connected

How to reproduce:

1. Create new project
2. Download input system package
3. In Project view create new input action file and open it
4. Expand "control scheme" dropdown and create new scheme
5. - notice All devices drop down becomes enabled -
6. Click All devices drop down

Expected result: If dropdown is enabled(expandable) it should show any other options, otherwise stay disabled.

Actual result: Dropdown does not show any other options

Reproduced with: 2020.3.44f1(1.4.4), 2022.2.16f1(1.5.1), 2023.2.0a19(1.6.1)