Why does new Cell[3] in repl output {null,null,null} instead of {Cell, Cell, Cell}

So I was wondering why in the video, where they make a spreadsheet, the Cell class: class Cell { public string Contents { get; set; } } shows up as a collection of null-values when initialized with: Cell[][] sheet = new Cell[100][]; //outputs 100x null: {null, null, null...}

or even when initialized with: sheet[rowIndex] = new Cell[10]; //outputs 100 x 10 x null

And only the following line, contained in a nested loop, will finally change the null-values into 'Cell' objects: sheet[rowIndex][colIndex] = new Cell(); //outputs: {Cell, Cell, Cell...}

This doesn't make sense to me, since both 'new Cell[] ' and 'new Cell()' have no input value, yet Cell() instanciates a {Cell}, and Cell[3] instanciates {null, null, null}, so basically the object clarification at the time of array initialization seems pointless, at least to me. So why does C# not leave out the specification to the Cell class until it matters, like so: [][] sheet = new [100][]; for (int i = 0; i < 100; i++) { sheet[i] = new [10]; for (int j = 0; j < 10; j++) { sheet[i][j] = Cell(); } }

What in particular does the 'Cell' keyword do at the time of (jagged) Array initialization?