### 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_READ_THREAD_GUARD_V(false);
	if (!data.initialized) {
		WARN_PRINT_ONCE("Attempting to access theme items too early; prefer NOTIFICATION_POSTINITIALIZE and NOTIFICATION_THEME_CHANGED");
	}
	if (p_theme_type == StringName() || p_theme_type == get_class_name() || p_theme_type == data.theme_type_variation) {
		if (has_theme_stylebox_override(p_name)) {
			return true;
		}
	}
	List<StringName> theme_types;
	data.theme_owner->get_theme_type_dependencies(this, p_theme_type, &theme_types);
	return data.theme_owner->has_theme_item_in_types(Theme::DATA_TYPE_STYLEBOX, p_name, theme_types);
}
bool Control::has_theme_font(const StringName &p_name, const StringName &p_theme_type) const {
	ERR_READ_THREAD_GUARD_V(false);
	if (!data.initialized) {
		WARN_PRINT_ONCE("Attempting to access theme items too early; prefer NOTIFICATION_POSTINITIALIZE and NOTIFICATION_THEME_CHANGED");
	}
	if (p_theme_type == StringName() || p_theme_type == get_class_name() || p_theme_type == data.theme_type_variation) {
		if (has_theme_font_override(p_name)) {
			return true;
		}
	}
	List<StringName> theme_types;
	data.theme_owner->get_theme_type_dependencies(this, p_theme_type, &theme_types);
	return data.theme_owner->has_theme_item_in_types(Theme::DATA_TYPE_FONT, p_name, theme_types);
}
bool Control::has_theme_font_size(const StringName &p_name, const StringName &p_theme_type) const {