Sequence.cs

public class Sequence : MonoBehaviour
{
    public BuildSequenceData BuildData => buildData;
    public Sprite SequenceExplainer => sequenceExplainer;

    public Action OnSequenceComplete;

    [SerializeField] private Sprite sequenceExplainer;
    [SerializeField] private BuildSequenceData buildData;
    [SerializeField] private GameObject screwSet;

    private TaskSequence[] taskSequences;
    private int currentCompletedSequences;

    public void StartLoadSequence()
    {
        screwSet.transform.position = new Vector3(2.59f, 0.761f, 0.324f);
        taskSequences = GetComponentsInChildren<TaskSequence>();
        foreach (TaskSequence tasks in taskSequences)
        {
            tasks.OnCompleted += TaskSequenceComplete;
            tasks.LoadSequence();
        }
    }

    private void TaskSequenceComplete(TaskSequence completedSequence)
    {
        currentCompletedSequences++;

        completedSequence.OnCompleted -= TaskSequenceComplete;

        if (currentCompletedSequences >= taskSequences.Length)
        {
            OnSequenceComplete?.Invoke();
        }
    }
}