### 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
case Variant::ARRAY: {
				Array varray = obj->get(E.name);
				int len = varray.size();
				for (int i = 0; i < len; i++) {
					const Variant &v = varray.get(i);
					Ref<Resource> res = v;
					if (_find_and_save_resource(res, processed, flags)) {
						ret_changed = true;
					}
				}
			} break;
			case Variant::DICTIONARY: {
				Dictionary d = obj->get(E.name);
				List<Variant> keys;
				d.get_key_list(&keys);
				for (const Variant &F : keys) {
					Variant v = d[F];
					Ref<Resource> res = v;
					if (_find_and_save_resource(res, processed, flags)) {
						ret_changed = true;
					}
				}
			} break;
			default: {
			}
		}
	}
	return ret_changed;
}
void EditorNode::_save_edited_subresources(Node *scene, HashMap<Ref<Resource>, bool> &processed, int32_t flags) {