### Godot version

v4.1.2.rc1.official [58f0cae4a] and v4.2.dev5.official [e3e2528ba]

### System information

Godot v4.1.2.rc1 - Windows 10.0.19044 - Vulkan (Compatibility) - NVIDIA GeForce GTX 1650 (NVIDIA; 31.0.15.3742) - AMD Ryzen 5 3550H with Radeon Vega Mobile Gfx (8 Threads)

### Issue description

Clearing one of the values of a typed array in the inspector seems to just unreference value and not set it to `<null>`, so the value becomes `<Object#null>`. Array's find function seems to look for the `<null>` value and doesn't accept `<Object#null>`, even if in GDScript `<Object#null>` == `<null>`. So, when calling array.find(null) in the tool script, the function can't find anything. When the project is restarted or you run it, the values that were equal to `<Object#null>` will become `<null>`.
![image](https://github.com/godotengine/godot/assets/118438257/208dbf2c-19ea-4d97-9e46-646662cb5122)

### Steps to reproduce

1. Export a typed array of Resource or any of the types that inherit from it;
2. Set one of the values of a typed array to anything;
3. Clear the value;
4. Use array.find(null) in any of the tool scripts.

### Minimal reproduction project

[ArrayBug.zip](https://github.com/godotengine/godot/files/12789530/ArrayBug.zip)
Dictionary dict = object->get_dict().duplicate();
	Variant key = dict.get_key_at_index(p_index);
	dict.erase(key);
	emit_changed(get_edited_property(), dict, "", false);
	update_property();
}
void EditorPropertyLocalizableString::update_property() {
	Variant updated_val = get_edited_property_value();
	if (updated_val.get_type() == Variant::NIL) {
		edit->set_text(TTR("Localizable String (Nil)")); 
		edit->set_pressed(false);
		if (container) {
			set_bottom_editor(nullptr);
			memdelete(container);
			button_add_item = nullptr;
			container = nullptr;
		}
		return;
	}
	Dictionary dict = updated_val;
	object->set_dict(dict);
	edit->set_text(vformat(TTR("Localizable String (size %d)"), dict.size()));
	bool unfolded = get_edited_object()->editor_is_section_unfolded(get_edited_property());
	if (edit->is_pressed() != unfolded) {
		edit->set_pressed(unfolded);
	}
	if (unfolded) {
		updating = true;
		if (!container) {
			container = memnew(MarginContainer);