That’s not quite what my testing has revealed. When you start a session every plane will have it’s correct custom views available. The problem starts whenever you CHANGE a custom view. As soon as you do, the plane you change the view in will “own” that view number for the rest of the session and all planes will see the view that was changed and not the correct view. Once the sim is restarted all views will be correct until another change is made.
Any view numbers that are not changed during the session will still be correct on all planes.