ShrinkTutorial/Runtime/Trigger/ShrinkTutorialAnchor.cs

using UnityEngine;

namespace ShrinkTutorial
{
    public class ShrinkTutorialAnchor : MonoBehaviour
    {
        [SerializeField] private string anchorId = string.Empty;

        public string AnchorId => anchorId;

        public void SetAnchorId(string value)
        {
            anchorId = value ?? string.Empty;

            if (isActiveAndEnabled)
                ShrinkTutorialAnchorRegistry.Register(this);
        }

        private void OnEnable()
        {
            ShrinkTutorialAnchorRegistry.Register(this);
        }

        private void OnDisable()
        {
            ShrinkTutorialAnchorRegistry.Unregister(this);
        }

        private void OnValidate()
        {
            if (!Application.isPlaying)
                return;

            ShrinkTutorialAnchorRegistry.Register(this);
        }
    }
}