None of my UAkAudioEvent assets have any properties set, what am I doing wrong?

Question

I'm mostly interested in the "Max Attenuation" value from an event, so I'm going to talk about that specifically, but none of the properties in the event asset appear to have any value other than 0.

When I call UAkAudioEvent::GetMaxAttenuationRadius() or UAkComponent::GetAttenuationRadius() it's always 0.

When I open an event uasset in the unreal editor, I can see all the values are 0 and I cannot edit any of them. Recreating the event uasset by dragging it from the waapi picker seems to do nothing (the event appears to be even more empty actually, as now "Platform asset data" is now also blank. But I can't figure out what that's pointing to, there doesn't appear to be a related uasset anywhere).

If I look at the generated soundbank data xml, I can see the events listed, and that they have a value of 50000 set for the max attenuation.