Break Interior settings for audio volume not working in 4.11?

I had this blueprint working fine in 4.10. I’m just trying to toggle the exterior volume of an audio volume when a door opens or closes. This is the setup that works in 4.10:

(That’s the toggle ‘open’ stream, the ‘close’ section is cutoff but is setup the same with a subtract.)

In 4.11, this blueprint is seemingly setting the exterior volume to zero - and it just stays there. It’s broken somewhere. Any idea why it would stop working in 4.11?