### 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
const String property_name = basename + vformat("/layer_%d", p_index + 1);
	if (ProjectSettings::get_singleton()->has_setting(property_name)) {
		ProjectSettings::get_singleton()->set(property_name, p_name);
		ProjectSettings::get_singleton()->save();
	}
}
String EditorPropertyLayers::get_layer_name(int p_index) const {
	const String property_name = basename + vformat("/layer_%d", p_index + 1);
	if (ProjectSettings::get_singleton()->has_setting(property_name)) {
		return GLOBAL_GET(property_name);
	}
	return String();
}
void EditorPropertyLayers::_button_pressed() {