rpc and rpc_id fail when argument is PackedVector2Array

[jjanella]

Godot version

4.0.dev (462bb3b)

System information

Arch Linux - I dont think this is an issue with my computer but i can provide logs/more specs if nessecary

Issue description

As the title says, trying to send a PackedVector2Array as the argument over rpc or rpc_id will fail. I work around it by packaging the PackedVector2Array inside an array and unpackaging it on the client side.

Steps to reproduce

Put this code in a multiplayer game. Have a client or server run it. Nothing happens or it crashes without explanation.

func send_data():
	rpc("sync_points", $Line2D.points)

@rpc(any_peer, unreliable_ordered)
func sync_points(points):
	$Line2D.points = points

Minimal reproduction project

Project: Every time a client connects every client gets another triangle on their screen. For it to work, host and client need workaround checked.
rpc_tests.zip
Issue with the zip but a different one was provided by gongpha below.

[Calinou]

@jjanella Please upload a minimal reproduction project to make this easier to troubleshoot.

PS: Code blocks should use triple backticks like this (with an optional language name for syntax highlighting):

```gdscript
code here
```

I edited your post accordingly, but remember to do this in the future 🙂

[jjanella]

rpc_tests.zip
Issue with the zip but a different one was provided by gongpha below.

Project: Every time a client connects every client gets another triangle on their screen. For it to work, host and client need workaround checked.

[gongpha]

I can't reproduce the error in Godot 4.2.1.stable and can send PackedVector2Array successfully. But instead, I got an error from sending an empty PackedByteArray.

E 0:00:06:0231   _process_rpc: RPC - 'Node(server.gd)::sync_points': Method expected 1 arguments, but called with 0
  <C++ Source>   modules/multiplayer/scene_rpc_interface.cpp:290 @ _process_rpc()

@jjanella Seems you added an empty zip file. So I will add mine instead.

base.gd

extends Node
class_name Base

func _ready() -> void :
	multiplayer.connected_to_server.connect(func() : print("Connected"))
	multiplayer.peer_connected.connect(_peer_con)
	
func _peer_con(peer : int) -> void :
	var data = PackedByteArray()
	sync_points.rpc_id(peer, data)
	
@rpc("any_peer", "unreliable_ordered")
func sync_points(data) -> void :
	print(data)

server.gd

extends Base

func _ready() -> void :
	super()
	print("server")
	
	var peer := ENetMultiplayerPeer.new()
	peer.create_server(5555, 2)
	multiplayer.multiplayer_peer = peer

client.gd

extends Base

func _ready() -> void :
	super()
	print("client")
	
	var peer := ENetMultiplayerPeer.new()
	peer.create_client("127.0.0.1", 5555)
	multiplayer.multiplayer_peer = peer

[jjanella]

That is odd that it was empty, thank you