### 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)
switch (p_what) {
		case NOTIFICATION_THEME_CHANGED:
		case NOTIFICATION_ENTER_TREE: {
			change_type->clear();
			for (int i = 0; i < Variant::VARIANT_MAX; i++) {
				if (i == Variant::CALLABLE || i == Variant::SIGNAL || i == Variant::RID) {
					
					continue;
				}
				String type = Variant::get_type_name(Variant::Type(i));
				change_type->add_icon_item(get_editor_theme_icon(type), type, i);
			}
			change_type->add_separator();
			change_type->add_icon_item(get_editor_theme_icon(SNAME("Remove")), TTR("Remove Item"), Variant::VARIANT_MAX);
			if (button_add_item) {
				button_add_item->set_icon(get_editor_theme_icon(SNAME("Add")));
			}
		} break;
	}
}
void EditorPropertyDictionary::_edit_pressed() {
	Variant prop_val = get_edited_property_value();
	if (prop_val.get_type() == Variant::NIL && edit->is_pressed()) {
		VariantInternal::initialize(&prop_val, Variant::DICTIONARY);
		get_edited_object()->set(get_edited_property(), prop_val);
	}
	get_edited_object()->editor_set_section_unfold(get_edited_property(), edit->is_pressed());
	update_property();
}
void EditorPropertyDictionary::_page_changed(int p_page) {