### 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)
emit_signal(SNAME("object_id_selected"), p_property, p_id);
}
void EditorPropertyArray::update_property() {
	Variant array = get_edited_property_value();
	String array_type_name = Variant::get_type_name(array_type);
	if (array_type == Variant::ARRAY && subtype != Variant::NIL) {
		String type_name;
		if (subtype == Variant::OBJECT && (subtype_hint == PROPERTY_HINT_RESOURCE_TYPE || subtype_hint == PROPERTY_HINT_NODE_TYPE)) {
			type_name = subtype_hint_string;
		} else {
			type_name = Variant::get_type_name(subtype);
		}
		array_type_name = vformat("%s[%s]", array_type_name, type_name);
	}
	if (!array.is_array()) {
		edit->set_text(vformat(TTR("(Nil) %s"), array_type_name));
		edit->set_pressed(false);
		if (container) {
			set_bottom_editor(nullptr);
			memdelete(container);
			button_add_item = nullptr;
			container = nullptr;