### Godot version

v4.0.beta15.official [4fa6edc88]

### System information

Windows 11

### Issue description

When drawing a polygon in the editor, several duplicate vertices are added to the polygon array for each click.  In the image below, I clicked three times to draw the triangle, but got 10 entries.  The number you get varies, though I don't know why; I've seen hundreds of points from drawing a hexagon.  I tested it with a Polygon2D, a CollisionPolygon2D, and a CollisionPolygon3D; the issues occurs with all of them.  It later occurred to me that this might happen with a Curve2D as well, and it does.

![image](https://user-images.githubusercontent.com/2808851/214926182-b8609b87-85a1-4a08-8017-be4eeec912c6.png)


### Steps to reproduce

Add a node that has a Polygon or Curve resource, such as a Polygon2D, draw some points, then check the PackedVector2Array resource.

### Minimal reproduction project

N/A
EditorPropertyNameProcessor *epnp = memnew(EditorPropertyNameProcessor);
	add_child(epnp);
	PortableCompressedTexture2D::set_keep_all_compressed_buffers(true);
	Input::get_singleton()->set_use_accumulated_input(true);
	Resource::_get_local_scene_func = _resource_get_edited_scene;
	RenderingServer::get_singleton()->set_debug_generate_wireframes(true);
	AudioServer::get_singleton()->set_enable_tagging_used_audio_streams(true);
	
	if (NavigationServer3D::get_singleton()->get_debug_enabled()) {
		NavigationServer3D::get_singleton()->set_active(true);
	} else {
		NavigationServer3D::get_singleton()->set_active(false);
	}
	
	PhysicsServer3D::get_singleton()->set_active(false);
	PhysicsServer2D::get_singleton()->set_active(false);
	
	ScriptServer::set_scripting_enabled(false);
	EditorHelp::generate_doc(); 
	SceneState::set_disable_placeholders(true);
	ResourceLoader::clear_translation_remaps(); 
	ResourceLoader::clear_path_remaps();
	ResourceLoader::set_create_missing_resources_if_class_unavailable(true);
	Input *id = Input::get_singleton();
	if (id) {
		if (!DisplayServer::get_singleton()->is_touchscreen_available() && Input::get_singleton()) {
			
			id->set_emulate_touch_from_mouse(false);