### Godot version

v4.1.stable.official [970459615]

### System information

Godot v4.1.stable - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1660 Ti (NVIDIA; 31.0.15.3598) - AMD Ryzen 7 3700X 8-Core Processor (16 Threads)

### Issue description

is_input_handled() is returning True, even though set_input_as_handled() has not been called.

Example:
`func _input_event(viewport, event, shape_idx):
	print(viewport.is_input_handled())`

Returns 'True', should return 'False'

### Steps to reproduce

1. Create a new project and add a Node2D as the root
2. Add a child Area2D node containing a CollisionShape2D and a Sprite2D
3. Either create the _input_event(viewport, event, shape_idx) or connect _on_input_event(viewport, event, shape_idx)
4. Print viewport.is_input_handled()
5. True is printed.

### Minimal reproduction project

[input_test.zip](https://github.com/godotengine/godot/files/12063748/input_test.zip)

if (p_control) {
		gui.drag_successful = _gui_drop(p_control, p_pos, false);
	} else {
		gui.drag_successful = false;
	}
	Control *drag_preview = _gui_get_drag_preview();
	if (drag_preview) {
		memdelete(drag_preview);
		gui.drag_preview_id = ObjectID();
	}
	gui.drag_data = Variant();
	gui.dragging = false;
	gui.drag_mouse_over = nullptr;
	_propagate_viewport_notification(this, NOTIFICATION_DRAG_END);
	
	update_mouse_cursor_state();
}
void Viewport::_gui_cleanup_internal_state(Ref<InputEvent> p_event) {