Why is information from the sheet removed from a static field?

Question

C++ / C#

Like there is a static sheet:

public static List<Cell> AllCell = new List<Cell>();

There is a method in which it is filled:

[ContextMenu("Generate grid")]
    public void GenerateGrid()
    {
        for(int x = 0; x < _gridSize.x; x++)
        {
            for(int z = 0; z < _gridSize.z; z++)
            {
                var cell = Instantiate(_cell, position, Quaternion.identity, _parent.transform);

                cell.name = $"Cell: x:{x}, z:{z}";

                GridActions.AllCell.Add(cell); // ВАЖНЫЕ СТРОЧКИ

                print(GridActions.AllCell[GridActions.AllCell.Count - 1].name); // И ЭТО
            }
        }
    }

I call the method in the editor. the most recent print outputs everything.

But then I wanted to do it and nothing happened to me. What's the catch?

This is:

private void Start()
    {
        foreach(Cell cell in GridActions.AllCell)
        {
            print(cell.name);
        }
    }

Answer 1

did it fill up at all?
At the start of the game, the static will be reset to zero. It is not serialized.