### 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)

return size_2d_override;
}
bool Viewport::_is_size_allocated() const {
	return size_allocated;
}
Rect2 Viewport::get_visible_rect() const {
	ERR_READ_THREAD_GUARD_V(Rect2());
	Rect2 r;
	if (size == Size2()) {
		r = Rect2(Point2(), DisplayServer::get_singleton()->window_get_size());
	} else {
		r = Rect2(Point2(), size);
	}
	if (size_2d_override != Size2i()) {
		r.size = size_2d_override;
	}
	return r;
}
void Viewport::canvas_parent_mark_dirty(Node *p_node) {