When undoing or redoing modifications to the audio source component resource field, the resource reference is lost if it was an audio random container.

*Regression details*

Reproducible on 2023.2.0b4 and up.

Not reproducible on 2023.2.0b3 and down.

*Repro*
# Create and open an empty project.
# Create an audio random container (Assets > Create > Audio > Audio Random Container).
# Import a clip.
# Create an audio source game object (GameObject > Audio > Audio Source).
# Drag the audio random container to the Audio Resource field in the audio source component.
# Drag the clip to the Audio Resource field in the audio source component.
# Undo the latest action.

Expected: The audio source has the audio random container resource.

Actual: The audio source resource is None.

*Note*

This only happens when the undo / redo action is between audio clip and audio random container.