HALion not playing back inside MuseScore

If you saw my first post, you probably know that I’m still using MuseScore for less notation-centered projects. I found that HALion is recognized as a compatible vst, and I’ve been using some free Steinberg sounds with it. However, it does not play sound within the vst interface, only with the MuseScore playback.

Is this supposed to happen? Can I change it?