Here comes the feedback from our engineers.
Sorry for the delay…
In “assignable mode”, the R/W buttons of nanoKontrol Studio send MIDI CC messages, which is why Cubasis treats them as buttons that don’t keep the state. There are two workarounds:
You could either use the KORG KONTROL Editor Software to configure a “Scene” where these buttons send MIDI Note messages (so Cubasis will treat them as buttons that keep the state)
or set nanoKontrol Studio to Cubase mode and, in Cubasis under Setup / MIDI, enable Mackie Control and disable MIDI Learn.
According to the manual, "while holding down the Scene and Marker Set buttons, turn on the nanoKONTROL Studio to set it to Cubase mode”.
To return to assignable mode, “While holding down the Scene and Cycle buttons, turn the nanoKONTROL Studio on to set it to assignable mode."