### 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 ((expansion_rows != prev_expansion_rows) && expanded) {
				update_minimum_size();
			}
			if ((expansion_rows == 0) && (layer_index == layer_count)) {
				
				break;
			}
			Ref<Texture2D> arrow = get_theme_icon(SNAME("arrow"), SNAME("Tree"));
			ERR_FAIL_COND(arrow.is_null());
			Color arrow_color = get_theme_color(SNAME("highlight_color"), SNAME("Editor"));
			arrow_color.a = expand_hovered ? 1.0 : 0.6;
			arrow_pos.x += 2.0;
			arrow_pos.y -= arrow->get_height();
			Rect2 arrow_draw_rect(arrow_pos, arrow->get_size());
			expand_rect = arrow_draw_rect;
			if (expanded) {
				arrow_draw_rect.size.y *= -1.0; 
			}
			RID ci = get_canvas_item();
			arrow->draw_rect(ci, arrow_draw_rect, false, arrow_color);
		} break;
		case NOTIFICATION_MOUSE_EXIT: {
			_on_hover_exit();
		} break;
	}
}
void EditorPropertyLayersGrid::set_flag(uint32_t p_flag) {