### 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)

ERR_MAIN_THREAD_GUARD;
	if (override_canvas_transform == p_enable) {
		return;
	}
	override_canvas_transform = p_enable;
	if (p_enable) {
		RenderingServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform_override);
	} else {
		RenderingServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform);
	}
}
bool Viewport::is_canvas_transform_override_enbled() const {
	ERR_READ_THREAD_GUARD_V(false);
	return override_canvas_transform;
}
void Viewport::set_canvas_transform_override(const Transform2D &p_transform) {
	ERR_MAIN_THREAD_GUARD;
	if (canvas_transform_override == p_transform) {
		return;
	}
	canvas_transform_override = p_transform;
	if (override_canvas_transform) {
		RenderingServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform_override);
	}
}
Transform2D Viewport::get_canvas_transform_override() const {
	ERR_READ_THREAD_GUARD_V(Transform2D());
	return canvas_transform_override;
}
void Viewport::set_canvas_transform(const Transform2D &p_transform) {