### 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(false);
	return is_inside_tree() && (!data.parent_canvas_item && !data.RI && is_set_as_top_level());
}
Control *Control::get_parent_control() const {
	ERR_READ_THREAD_GUARD_V(nullptr);
	return data.parent_control;
}
Window *Control::get_parent_window() const {
	ERR_READ_THREAD_GUARD_V(nullptr);
	return data.parent_window;
}
Control *Control::get_root_parent_control() const {
	ERR_READ_THREAD_GUARD_V(nullptr);
	const CanvasItem *ci = this;
	const Control *root = this;
	while (ci) {
		const Control *c = Object::cast_to<Control>(ci);
		if (c) {
			root = c;
			if (c->data.RI || c->is_top_level_control()) {
				break;
			}
		}
		ci = ci->get_parent_item();
	}
	return const_cast<Control *>(root);
}
Rect2 Control::get_parent_anchorable_rect() const {