Looks like "backdrop" sound is also not working. I changed it to forest ambience and it's not playing. Editing the sky, adding fog, etc all works though.
Sound effects you add to the game don't seem to work. They worked fine when testing inside the foundry with the "play from here" options but when I found my quest ingame and played through it, none of them played. This is a pretty big issue since the thing I'm working on is heavily reliant on sound effects to create…