On this picture from you
https://forum.cockos.com/attachment....7&d=1559492007
the whole-note C3 is in staff 2. There are no ledger lines leading from staff 1. The rest in staff 2 means there are no notes in voice 1. If you would select that rest, it would be blue indicating this.
There are all notes assigned to staff 1 on my picture here
https://i.imgur.com/zJL3fy2.png .
Or do you maybe have another example better illustrating your point?