Bug or feature? – Just Sudoku - Puzzle Game Review

When Smart Buttons is enabled, and taking notes and you accidentally press a disabled button, the note still appears. So, if buttons “1” and “3” are enabled (in note taking mode) and you press “4” (which is disabled), the “4” note will still appear. Is this intended or not?
Review by Chewdoggie9 on Just Sudoku - Puzzle Game.