Reproduction steps:
1. Open the attached “BugReport1.zip“ project
2. Open the “Assets/Scenes/SampleScene.unity“ Scene
3. Select the “Capsule“ GameObject in the Hierarchy
4. Double-click the “Left Stick [Gamepad]“ Input Action under the My Script Component
5. Try to expand the “Axis Deadzone“ Processor’s dropdown
6. Observe

Expected result: Dropdown expands, Processor fields are exposed
Actual result: Dropdown doesn’t expand, no customizable fields are present

Reproducible with: 1.9.0 (2022.3.54f1), 1.11.2 (2022.3.54f1, 6000.0.30f1, 6000.1.0a7)
Not reproducible with: 1.8.2 (2022.3.54f1)

Reproducible on: M1 Max MacOS 15.1.1
Not reproducible on: No other environment tested