### Godot version

4.1 dev2, 4.0.3

### System information

Windows 10, ryzen 5900x, radeon 6950xt (driver: 23.2.2)

### Issue description

There are two bugs:
- When I create a new node, it is created outside of the viewport. (as in first video)
- When I run the project, all the content inside the viewport dont appear. (as in second video)
I believe the second issue is related to the first.

Note: these problems are in RTL editors.

https://github.com/godotengine/godot/assets/121864036/84f0d434-0d1b-4c23-9fb0-510257e2e191


https://github.com/godotengine/godot/assets/121864036/b2bc20c7-1e2e-4d04-99e7-d66860ffced2




### Steps to reproduce

Videos explain.

### Minimal reproduction project

N/A
ERR_READ_THREAD_GUARD_V(Rect2());
	if (!is_inside_tree()) {
		return Rect2();
	}
	Rect2 parent_rect;
	if (data.parent_canvas_item) {
		parent_rect = data.parent_canvas_item->get_anchorable_rect();
	} else {
#ifdef TOOLS_ENABLED
		Node *edited_scene_root = get_tree()->get_edited_scene_root();
		Node *scene_root_parent = edited_scene_root ? edited_scene_root->get_parent() : nullptr;
		if (scene_root_parent && get_viewport() == scene_root_parent->get_viewport()) {
			parent_rect.size = Size2(GLOBAL_GET("display/window/size/viewport_width"), GLOBAL_GET("display/window/size/viewport_height"));
		} else {
			parent_rect = get_viewport()->get_visible_rect();
		}
#else
		parent_rect = get_viewport()->get_visible_rect();
#endif
	}
	return parent_rect;
}
Size2 Control::get_parent_area_size() const {
	ERR_READ_THREAD_GUARD_V(Size2());
	return get_parent_anchorable_rect().size;
}
Transform2D Control::_get_internal_transform() const {