Godot duplicate and tween flicky - animation

Question

I am using Godot v3.42-v3.45 to make an implemetation of the boardgame Citadel. In order to make a card move, I develop a tween system. But sometimes the original card node will be "queue_free()"ed immediately after the tween starts, and the card will be gone from the screen and I don't want to wait till it's finished. So I try to make a copy node for just animation, hide the original one, set the final values on the original node, run the tween, show the original node and hide the copied node. But it gets flicky, the copied node seems to blink when the tween is finished. I try a lot of measures but it still blinks. Could anybody help me? Please run the ani_flip_move() function.
extends Node2D
onready var TimerGlobal = get_node("/root/Main/Timer") # a global timer stick to the main scene
onready var Data = get_node("/root/Main/Data") # Data.XXX is just some constants, Data.FAR_AWAY = Vector2(99999, 99999)
onready var Signal = get_node("/root/Main/Signal") # a signal bus stick to the main scene
class Trans:
var motion_list: Array
var copies: Dictionary
func _init() -> void:
motion_list = []
copies = {}
func add(node: Node2D, prop_name: String, start_val, end_val, ani_time: float = 1) -> void:
var copy
if node in copies:
copy = copies[node]
else:
copy = node.duplicate(node.DUPLICATE_USE_INSTANCING)
copies[node] = copy
node.set(prop_name, end_val)
motion_list.append([node, copy, prop_name, start_val, end_val, ani_time])
class Interval:
var wait_time: float
func _init(times: float) -> void:
wait_time = times
func animate(action_list: Array) -> void:
var _useless
var tween = Tween.new()
add_child(tween)
for action in action_list:
if action is Trans:
for motion in action.motion_list:
var orgi_node = motion[0]
var copy_node = motion[1]
var prop_name = motion[2]
var start_val = motion[3]
var end_val = motion[4]
var ani_time = motion[5]
orgi_node.set(prop_name, end_val)
orgi_node.set_visible(false)
if not copy_node.is_inside_tree():
add_child(copy_node)
_useless = tween.interpolate_property(
copy_node,
prop_name,
start_val,
end_val,
ani_time,
Tween.TRANS_CUBIC,
Tween.EASE_IN_OUT
)
_useless = tween.start()
yield(tween, "tween_all_completed")
for motion in action.motion_list:
var orgi_node = motion[0]
var copy_node = motion[1]
if is_instance_valid(orgi_node):
orgi_node.set_visible(true)
orgi_node.set_z_index(0)
if is_instance_valid(copy_node):
copy_node.set_z_index(0)
copy_node.queue_free()
elif action is Interval:
TimerGlobal.set_wait_time(action.wait_time)
TimerGlobal.start()
yield(TimerGlobal, "timeout")
remove_child(tween)
tween.queue_free()
Signal.emit_signal("all_ani_completed")
func ani_flip_move(
obj: Node2D,
end_pos: Vector2 = Data.FAR_AWAY,
end_scale: Vector2 = Data.FAR_AWAY,
end_visible: bool = true,
end_face_up: bool = true,
ani_time: int = 1
) -> void:
if end_scale == Data.FAR_AWAY:
end_scale = obj.scale
if end_pos == Data.FAR_AWAY:
end_pos = obj.global_position
var a1 = Trans.new()
var z_index = obj.z_index
a1.add(obj, "global_position", obj.global_position, end_pos, ani_time)
a1.add(obj, "scale", obj.scale, end_scale, ani_time)
a1.add(obj, "z_index", 1, 1, ani_time)
if "face_up" in obj:
a1.add(obj, "face_up", obj.face_up, end_face_up, ani_time)
animate([a1])