Triggering ARC in edit mode after a domain reload crashes the editor on AudioPlayableOutput::SetTargetAudioSource.

*Repro*
# Open the attached project (`ARC Edit Mode Crash.zip`).
# Open the `SampleScene`.
# Trigger a domain reload. Simplest way is to right-click on a script and select `Reimport`.
# Use the test menu item `Crash Test > Trigger Audio Source` to trigger the audio source in the scene in edit mode.

Expected: The ARC plays.

Actual: The editor crashes.

*Note*

Only happens if the audio source resource remains the same, i.e. doesn't happen if you change the resource to a clip and back to an ARC, but still it does happen if you change the resource to a different ARC.