Photon Voice ignores game version when joining a room

I'm using PUN and Photon Voice in Unity. If I initialize Photon with two separate game version strings and have two clients join the same room name, PUN will put them in isolated rooms as expected, but they'll join the same Voice room. Which means players in separate games can talk to each other. I never noticed this before. Not sure if it's a new bug or not.

Any ideas?

Max