And once again

scenes_old_2/utils/server_data/server_data.gd

@@ -0,0 +1,18 @@
+class_name ServerData extends Node
+
+@export var players: Dictionary = {}
+@export var port: int = 27015
+@export var player_limit: int = 30
+@export var current_map: String = "lowpoly_tdm_2"
+
+@rpc("any_peer", "reliable", "call_local")
+func set_player_side(side: String):
+	if multiplayer.is_server():
+		var id: int = multiplayer.get_remote_sender_id()
+		if players.has(id):
+			players[id]["side"] = side
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass

scenes_old_2/utils/server_data/server_data.tscn

@@ -0,0 +1,17 @@
+[gd_scene load_steps=3 format=3 uid="uid://cu6t3m38skton"]
+
+[ext_resource type="Script" path="res://scenes/utils/server_data/server_data.gd" id="1_o07e3"]
+
+[sub_resource type="SceneReplicationConfig" id="SceneReplicationConfig_t8y34"]
+properties/0/path = NodePath(".:players")
+properties/0/spawn = true
+properties/0/replication_mode = 1
+properties/1/path = NodePath(".:current_map")
+properties/1/spawn = true
+properties/1/replication_mode = 1
+
+[node name="ServerData" type="Node"]
+script = ExtResource("1_o07e3")
+
+[node name="MultiplayerSynchronizer" type="MultiplayerSynchronizer" parent="."]
+replication_config = SubResource("SceneReplicationConfig_t8y34")