### 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
for (int i = 0; i < 4; i++) {
		spin[i]->set_read_only(p_read_only);
	}
}
void EditorPropertyPlane::_value_changed(double val, const String &p_name) {
	if (setting) {
		return;
	}
	Plane p;
	p.normal.x = spin[0]->get_value();
	p.normal.y = spin[1]->get_value();
	p.normal.z = spin[2]->get_value();
	p.d = spin[3]->get_value();
	emit_changed(get_edited_property(), p, p_name);
}
void EditorPropertyPlane::update_property() {
	Plane val = get_edited_property_value();
	setting = true;
	spin[0]->set_value(val.normal.x);
	spin[1]->set_value(val.normal.y);
	spin[2]->set_value(val.normal.z);
	spin[3]->set_value(val.d);
	setting = false;
}
void EditorPropertyPlane::_notification(int p_what) {