### Godot version

543750a1b3f5696f9ba8e91cb49dc7db05d2ae62

### System information

Windows 10, Vulkan

### Issue description

This is a regression since v4.1.dev4.official [5c2295ff5], I can't bisect atm to find the commit that caused it, maybe https://github.com/godotengine/godot/pull/77651 but that's just a guess.
When a HBoxContainer has a label child, and that label's text is changed, one used to be able to find the new size of the container by using call_deferred, this is no longer the case.

MRP correct behavior (v4.1.dev4.official [5c2295ff5]):
![image](https://github.com/godotengine/godot/assets/115422160/1b4a2b6f-ef19-42c1-b3e5-9f0c499a7a8c)
MRP incorrect (543750a1b3f5696f9ba8e91cb49dc7db05d2ae62):
![image](https://github.com/godotengine/godot/assets/115422160/25b711ae-7c3a-4c48-aff7-383bb8f600c3)




### Steps to reproduce

```gdscript
extends Control

@onready var h_box_container: HBoxContainer = $HBoxContainer
@onready var label: Label = $HBoxContainer/Label

func _ready() -> void:
	label.text = "larger non default text"
	print("h_box_container size.x: ", h_box_container.size.x)
	call_deferred("size_after_text_changed")

func size_after_text_changed() -> void:
	print("deferred h_box_container size.x: ", h_box_container.size.x)
```

### Minimal reproduction project

[call_deferred bug.zip](https://github.com/godotengine/godot/files/11654441/call_deferred.bug.zip)

ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_COND(!is_inside_tree());
	if (!has_focus()) {
		return;
	}
	get_viewport()->gui_release_focus();
}
static Control *_next_control(Control *p_from) {
	if (p_from->is_set_as_top_level()) {
		return nullptr; 
	}
	Control *parent = Object::cast_to<Control>(p_from->get_parent());
	if (!parent) {
		return nullptr;
	}
	int next = p_from->get_index();
	ERR_FAIL_INDEX_V(next, parent->get_child_count(), nullptr);
	for (int i = (next + 1); i < parent->get_child_count(); i++) {
		Control *c = Object::cast_to<Control>(parent->get_child(i));
		if (!c || !c->is_visible_in_tree() || c->is_set_as_top_level()) {
			continue;
		}
		return c;
	}
	
	return _next_control(parent);
}
Control *Control::find_next_valid_focus() const {