Previous/Next Instrument Midi assignement doesnt work!(?)

Hello,

I am new to Pianoteq and this forum and I am trying to configure a midi controller to interface with the instrument. Although previous/next preset assigned to some buttons works just fine the previous/next instrument does not work in any configuration I tried (also used multiple midi controllers).
Has anyone else run into this bug? Is it a bug?
Any help will be much appreciated as I would like to operate the instrument without a screen.
Thanks!