### 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
StringName base = base_scr->get_instance_base_type();
			if (base != StringName() && EditorNode::get_editor_data().get_custom_types().has(base)) {
				const Vector<EditorData::CustomType> &types = EditorNode::get_editor_data().get_custom_types()[base];
				for (int i = 0; i < types.size(); ++i) {
					if (types[i].script == base_scr && types[i].icon.is_valid()) {
						script_icon_cache[scr] = types[i].icon;
						return types[i].icon;
					}
				}
			}
			base_scr = base_scr->get_base_script();
		}
		
		script_icon_cache[scr] = Ref<Texture>();
	} else if (scr.is_valid() && script_icon_cache.has(scr) && script_icon_cache[scr].is_valid()) {
		return script_icon_cache[scr];
	}
	
	if (p_object->has_meta("_editor_icon")) {
		return p_object->get_meta("_editor_icon");
	}
	if (gui_base->has_theme_icon(p_object->get_class(), SNAME("EditorIcons"))) {
		return gui_base->get_theme_icon(p_object->get_class(), SNAME("EditorIcons"));
	}
	if (p_fallback.length()) {
		return gui_base->get_theme_icon(p_fallback, SNAME("EditorIcons"));
	}
	return nullptr;
}
Ref<Texture2D> EditorNode::get_class_icon(const String &p_class, const String &p_fallback) const {