### 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)
size_slider->set_max(INT32_MAX);
			size_slider->set_h_size_flags(SIZE_EXPAND_FILL);
			size_slider->set_read_only(is_read_only());
			size_slider->connect("value_changed", callable_mp(this, &EditorPropertyArray::_length_changed));
			hbox->add_child(size_slider);
			property_vbox = memnew(VBoxContainer);
			property_vbox->set_h_size_flags(SIZE_EXPAND_FILL);
			vbox->add_child(property_vbox);
			button_add_item = EditorInspector::create_inspector_action_button(TTR("Add Element"));
			button_add_item->set_icon(get_editor_theme_icon(SNAME("Add")));
			button_add_item->connect(SNAME("pressed"), callable_mp(this, &EditorPropertyArray::_add_element));
			button_add_item->set_disabled(is_read_only());
			vbox->add_child(button_add_item);
			paginator = memnew(EditorPaginator);
			paginator->connect("page_changed", callable_mp(this, &EditorPropertyArray::_page_changed));
			vbox->add_child(paginator);
		} else {
			
			for (int i = property_vbox->get_child_count() - 1; i >= 0; i--) {
				Node *child = property_vbox->get_child(i);
				if (child == reorder_selected_element_hbox) {
					continue; 
				}
				child->queue_free(); 
				property_vbox->remove_child(child);
			}
		}
		size_slider->set_value(size);
		property_vbox->set_visible(size > 0);
		button_add_item->set_visible(page_index == max_page);