No, this is a bug. You should be able to add Resonance Audio Listener effects to buses.
It looks like this issue was introduced in FMOD Studio versions 2.02.23 and 2.03.02. In versions 2.03.00 and 2.03.01, and versions 2.02.22 and earlier, Resonance Audio Listener effects can be added to buses without problems.
I’ve added this issue to our bug tracker, so that it can be fixed in an upcoming release of FMOD Studio. In the mean time, you should be able to work around the issue by opening your project in FMOD Studio version 2.03.01, adding the Resonance Audio Listener effect to the bus of your choice, then saving and closing the project before opening it again in version 2.03.02.