### 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);
	}
	for (int i = 0; i < 3; i++) {
		euler[i]->set_read_only(p_read_only);
	}
}
void EditorPropertyQuaternion::_edit_custom_value() {
	if (edit_button->is_pressed()) {
		edit_custom_bc->show();
		for (int i = 0; i < 3; i++) {
			euler[i]->grab_focus();
		}
	} else {
		edit_custom_bc->hide();
		for (int i = 0; i < 4; i++) {
			spin[i]->grab_focus();
		}
	}
	update_property();
}
void EditorPropertyQuaternion::_custom_value_changed(double val) {