Doesn't update sound Attenuation if used sound Attenuation node at anim sequence editor.

There is a problem with the sound update when using "Sound Attenuation" in the Animation Editor.

In the Animation Editor, if the mouse cursor is located in a viewport and you change the position of the camera by adjusting the mouse wheel without clicking the viewport, the Sound Attenuation will not be updated to the position of the camera. Sound Attenuation is updated as soon as you click the viewport.  

I will attached video for that issue. 

1. Created sound cue asset.  
2. Adding sound wave and Attenuation node in Sound cue editor. 
3. Adding sound attenuation asset in Attenuation settings.  
4. Adding sound notify at Anim sequnce editor. 
5. Move to another window(ex sounds cue editor).
6. Back to the Anim sequnce editor. 
7. Using the mouse wheel to adjust the camera distance.
8. You can listened sound but doesn't update sound attenuation.
9. After you can listened update sound attenuation if mouse click viewport.