That’s right ! I can confirm this !
We can drag notes from a MIDI Track to any other MIDI or Instrument/Sampler Track, which creates a new Event, but, when we do that from an Instrument Track or a Sample Track, the Event can only be created on a free space as a new MIDI Track. For some reason we simply cannot drop the notes into an existing track.
I will open a support ticket for this one.
Added to the issues list, number 40.