Reproduction steps:
1. Open the attached “inputcontrolscheme.zip” project
2. Open the “InputSystem.inputactions“ from the Project Window
3. Open the “All Control Schemes” dropdown
4. Select “Add Control Scheme…”
5. Deselect the menu by clicking outside of the menu
6. Observe the Actions in the Input Actions Editor

Expected result: The Actions still have dropdowns
Actual result: The Actions dropdowns have disappeared

Reproducible with: 1.8.0-pre.2 (2022.3.50f, 6000.0.23f1, 6000.1.0a1), 1.11.1 (2022.3.50f1, 6000.0.23f1, 6000.1.0a1)
Not reproducible with: 1.8.0-pre.1 (2021.3.45f1, 2022.3.50f1, 6000.0.23f1, 6000.1.0a1), 1.8.0-pre.2 (2021.3.45f1), 1.11.1 (2021.3.45f1)

Reproducible on: Windows 11
Not reproducible on: no other environment tested

Notes:
- Can also be reproduced on a new project by creating a new Project-Wide Actions Asset
- Reopening the Input Actions Asset fixes the issue