How to reproduce:
1. Open the attached project “IN-132483”
2. Open the “OutdoorsScene“
3. In the Hierarchy, select the “TEST InputActionBehaviour” GameObject
4. In the Inspector, double click the “G [Keyboard]” Input Action
5. Attempt to expand the “Custom Scale” or “Stick Deadzone” Processors
6. Observe the Processors

Actual result: The “Custom Scale” and “Stick Deadzone” Processors are not able to be expanded and do not show their properties
Expected result: The “Custom Scale” and “Stick Deadzone” Processors can be expanded and show their associated properties

Reproducible with: 1.17.0 (6000.0.66f2), 1.18.0 (6000.0.66f2, 6000.3.6f1, 6000.4.0b6, 6000.5.0a5)
Not reproducible with: 1.16.0 (6000.0.66f2)

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note: Issue appears to have been fixed previously in version 1.12.0 under issue “ISXB-1269”