### 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)
paginator->update(page_index, max_page);
		paginator->set_visible(max_page > 0);
		int amount = MIN(size - offset, page_length);
		for (int i = 0; i < amount; i++) {
			bool reorder_is_from_current_page = reorder_from_index / page_length == page_index;
			if (reorder_is_from_current_page && i == reorder_from_index % page_length) {
				
				continue;
			}
			if (!reorder_is_from_current_page && i == reorder_to_index % page_length) {
				
				
				
				continue;
			}
			HBoxContainer *hbox = memnew(HBoxContainer);
			property_vbox->add_child(hbox);
			Button *reorder_button = memnew(Button);
			reorder_button->set_icon(get_editor_theme_icon(SNAME("TripleBar")));
			reorder_button->set_default_cursor_shape(Control::CURSOR_MOVE);
			reorder_button->set_disabled(is_read_only());
			reorder_button->connect("gui_input", callable_mp(this, &EditorPropertyArray::_reorder_button_gui_input));
			reorder_button->connect("button_down", callable_mp(this, &EditorPropertyArray::_reorder_button_down).bind(i + offset));
			reorder_button->connect("button_up", callable_mp(this, &EditorPropertyArray::_reorder_button_up));
			hbox->add_child(reorder_button);
			String prop_name = "indices/" + itos(i + offset);
			EditorProperty *prop = nullptr;
			Variant value = array.get(i + offset);
			Variant::Type value_type = value.get_type();
			if (value_type == Variant::NIL && subtype != Variant::NIL) {