Rack instrument preview stays connected

Open rack window.
Select a track preset for a vsti
Preview it with a midi keyboard
Close rack window
Vsti preview stays connected to midi keyboard.

Undesired behaviour.

Note: disconnection can be made by clicking the ‘reset result filters’ tab.

I had this happen when first checking out CB8.

At first I couldn’t figure out what it was.
The sound was actually playing along with another Track Instrument I had open.
Can’t remember which VSTis it was.

Eventually had to close and reopen Cubase to stop it.