When can a plugin change its number of audio busses?

Developer VST 3 SDK
1

I’m writing this from the point of view of a host developer where I’m seeing a plugin (Kontakt 7) initially returning 59 from getBusCount(kAudio, kOutput) and then later returning 53.

Both calls to getBusCount are after IComponent::initialize has been called and no intervening IComponentHandler::restartComponent callback.

Is there any situation where it’s valid for a plugin to report inconsistent values here? Just want to check before reporting to the plugin dev.

2

The plugin should call restartComponent (kIoChanged) (in the UI Thread from the editController). Then the host could react by asking the busses…