### Godot version

9f12e7b52d944

### System information

arch linux

### Issue description

Attempting to edit from the editor a typed array exported from a tool script fails, any value is immediately reset, setters are never called.

### Steps to reproduce

Create a script such as follows and try to add and then change items of the array in the inspector.


```gdscript
@tool
extends Node

@export var x: Array[String]
```

### Minimal reproduction project

n/a
if (read_only) {
		return;
	}
	const Ref<InputEventMouseMotion> mm = p_ev;
	if (mm.is_valid()) {
		_update_hovered(mm->get_position());
		return;
	}
	const Ref<InputEventMouseButton> mb = p_ev;
	if (mb.is_valid() && mb->get_button_index() == MouseButton::LEFT && mb->is_pressed()) {
		_update_hovered(mb->get_position());
		_update_flag();
	}
	if (mb.is_valid() && mb->get_button_index() == MouseButton::RIGHT && mb->is_pressed()) {
		if (hovered_index >= 0) {
			renamed_layer_index = hovered_index;
			layer_rename->set_position(get_screen_position() + mb->get_position());
			layer_rename->reset_size();
			layer_rename->popup();
		}
	}
}
void EditorPropertyLayersGrid::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_DRAW: {
			Size2 grid_size = get_grid_size();
			grid_size.x = get_size().x;
			flag_rects.clear();