Unity Event fields for each Action Map are missing in the "PlayerInput" inspector until the GameObject is reselected

Steps to reproduce:

1. Create a new Project with Universal 3D template
2. Create a new GameObject
3. Add a “Player Input” component to the created GameObject
4. Set Behavior to "Invoke Unity Events"
5. Expand the Events dropdown
6. Observe the Events dropdown
7. Select another GameObject in the Hierarchy
8. Select the GameObject containing the “Player Input” component again
9. Expand the Events dropdown
10. Observer the Events dropdown

Actual result: The "Player" and "UI" fields are initially missing and only appear after selecting another GameObject and then returning to the GameObject containing the “Player Input” component
Expected result: The "Player" and "UI" Unity Event fields should be visible on the first time immediately after expanding the Events dropdown

Reproducible with: 1.14.1 (6000.0.0f1), 1.20.0 (6000.6.0f1, 6000.7.0a6), 6.7.0 (6000.7.0a6)
Not Reproducible with: 1.14.0 (6000.0.0f1)

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