public class GroundChecker : MonoBehaviour {

    private Character player;
    private void Start()
    {
        player = GetComponentInParent<Character>();
    }
     private void OnTriggerEnter2D(Collider2D collision)
       {
           if ( collision.gameObject.layer==8)//8 слой-слой с объектами по которым можно ходить
           {
               player.onGround = true;
              
           }
    
    }
    private void OnTriggerStay2D(Collider2D collision)
    {
        if (collision.gameObject.layer == 8)
        {
            player.onGround = true;
        }
    }
//Проблемный участок//
    private void OnTriggerExit2D(Collider2D collision)
       {
           if (collision.gameObject.layer==8)
           {
               player.onGround = false;
      
           }
       }
    

}