How to reproduce:
1. Open the attached project "IN-126633"
2. In the Project window, select the "TestObject" Prefab Asset
3. In the Inspector, attempt to set an InputActionReference in the "Reference" field under the "Testing Script" component
4. Observe the "Reference" field
Actual result: InputActionReference is not set
Expected result: InputActionReference is set
Reproducible with: 1.16.0 (6000.0.62f1), 1.17.0 (6000.0.64f1, 6000.3.1f1, 6000.4.0b1, 6000.5.0a3)
Not reproducible with: 1.15.0 (6000.0.62f1)
Reproducible on: Windows 11
Not reproducible on: No other environments tested