### 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
Control *child = nullptr;
	for (int i = p_from->get_child_count() - 1; i >= 0; i--) {
		Control *c = Object::cast_to<Control>(p_from->get_child(i));
		if (!c || !c->is_visible_in_tree() || c->is_set_as_top_level()) {
			continue;
		}
		child = c;
		break;
	}
	if (!child) {
		return p_from;
	}
	
	return _prev_control(child);
}
Control *Control::find_prev_valid_focus() const {