### 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)
return;
		}
		float required_y_distance = 20.0f * EDSCALE;
		if (ABS(reorder_mouse_y_delta) > required_y_distance) {
			int direction = reorder_mouse_y_delta > 0.0f ? 1 : -1;
			reorder_mouse_y_delta -= required_y_distance * direction;
			reorder_to_index += direction;
			if ((direction < 0 && reorder_to_index % page_length == page_length - 1) || (direction > 0 && reorder_to_index % page_length == 0)) {
				
				_page_changed(page_index + direction);
			}
			property_vbox->move_child(reorder_selected_element_hbox, reorder_to_index % page_length);
			
			InspectorDock::get_inspector_singleton()->ensure_control_visible(reorder_selected_element_hbox);
		}
	}
}
void EditorPropertyArray::_reorder_button_down(int p_index) {
	if (is_read_only()) {
		return;
	}
	reorder_from_index = p_index;
	reorder_to_index = p_index;
	reorder_selected_element_hbox = Object::cast_to<HBoxContainer>(property_vbox->get_child(p_index % page_length));
	reorder_selected_button = Object::cast_to<Button>(reorder_selected_element_hbox->get_child(0));
	
	
	Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
}
void EditorPropertyArray::_reorder_button_up() {