var forgive_group

func _ready():
    forgive_group = "forgive_" + str(get_instance_id())
    ForgiveArea.body_entered.connect(_earlyProcessItem)
    #...
#...

func _earlyProcessItem(body:Node2D):
    if not body.is_in_group(forgive_group):
        body.add_to_group(forgive_group)

func _processItem(body:Node2D):
    var Item = body as ItemClass
    #Check how item compares to the mode the machine is on
    if self.ItemIsCorrectType(Item):
        #...
    elif body.is_in_group(forgive_group):
        pass #
    else:
        #...