Could reproduce in version 4.0.0b12 (b6f69b69a8be)

To reproduce:
- Open attached project and launch scene "Audio3DSource"
- Hit Play
- Use the WASD key to move towards the yellow and red spheres
- Observe that when you are outside the yellow sphere, you can still hear the sound

Maybe this is intentional design, but as a user it is not intuitive that the sound continues to play, when the listener is placed at a location that is way over the max distance of the Audio Source