How to reproduce:
1. Open the “IN-105971_TestInputActionReference“ project
2. Open the “SampleScene”
3. In the Hierarchy window select the “InputActionRefTest” GameObject
4. In the Inspector set the “Action Reference” field to “Player/Action_A”
5. Enter Play Mode
6. Exit Play Mode
7. Observe the “Action Reference” field

Expected result: The value is reset to the original reference
Actual result: the value stays changed

Reproducible with: 1.8.2(6000.0.10f1), 1.11.2 (6000.0.35f1), 1.14.0 (2022.3.63f1, 6000.0.51f1, 6000.1.9f1, 6000.2.0b7)

Reproducible on: macOS 15.5 (M1 Max)
Not reproducible on: no other environments tested

Note: If you set the “Action Reference” value to “None” and enter Play Mode, the reference is reset and “Action_A” is available again