### 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)

bool stopped = false;
	Ref<InputEvent> ev = p_input;
	
	bool is_pointer_event = Ref<InputEventMouse>(p_input).is_valid() || Ref<InputEventScreenDrag>(p_input).is_valid() || Ref<InputEventScreenTouch>(p_input).is_valid();
	Ref<InputEventMouseButton> mb = p_input;
	bool is_scroll_event = mb.is_valid() &&
			(mb->get_button_index() == MouseButton::WHEEL_DOWN ||
					mb->get_button_index() == MouseButton::WHEEL_UP ||
					mb->get_button_index() == MouseButton::WHEEL_LEFT ||
					mb->get_button_index() == MouseButton::WHEEL_RIGHT);
	CanvasItem *ci = p_control;
	while (ci) {
		Control *control = Object::cast_to<Control>(ci);