### 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)

ClassDB::bind_method(D_METHOD("set_world_2d", "world_2d"), &Viewport::set_world_2d);
	ClassDB::bind_method(D_METHOD("get_world_2d"), &Viewport::get_world_2d);
	ClassDB::bind_method(D_METHOD("find_world_2d"), &Viewport::find_world_2d);
	ClassDB::bind_method(D_METHOD("set_canvas_transform", "xform"), &Viewport::set_canvas_transform);
	ClassDB::bind_method(D_METHOD("get_canvas_transform"), &Viewport::get_canvas_transform);
	ClassDB::bind_method(D_METHOD("set_global_canvas_transform", "xform"), &Viewport::set_global_canvas_transform);
	ClassDB::bind_method(D_METHOD("get_global_canvas_transform"), &Viewport::get_global_canvas_transform);
	ClassDB::bind_method(D_METHOD("get_final_transform"), &Viewport::get_final_transform);
	ClassDB::bind_method(D_METHOD("get_screen_transform"), &Viewport::get_screen_transform);
	ClassDB::bind_method(D_METHOD("get_visible_rect"), &Viewport::get_visible_rect);
	ClassDB::bind_method(D_METHOD("set_transparent_background", "enable"), &Viewport::set_transparent_background);
	ClassDB::bind_method(D_METHOD("has_transparent_background"), &Viewport::has_transparent_background);
	ClassDB::bind_method(D_METHOD("set_msaa_2d", "msaa"), &Viewport::set_msaa_2d);
	ClassDB::bind_method(D_METHOD("get_msaa_2d"), &Viewport::get_msaa_2d);
	ClassDB::bind_method(D_METHOD("set_msaa_3d", "msaa"), &Viewport::set_msaa_3d);
	ClassDB::bind_method(D_METHOD("get_msaa_3d"), &Viewport::get_msaa_3d);
	ClassDB::bind_method(D_METHOD("set_screen_space_aa", "screen_space_aa"), &Viewport::set_screen_space_aa);
	ClassDB::bind_method(D_METHOD("get_screen_space_aa"), &Viewport::get_screen_space_aa);
	ClassDB::bind_method(D_METHOD("set_use_taa", "enable"), &Viewport::set_use_taa);
	ClassDB::bind_method(D_METHOD("is_using_taa"), &Viewport::is_using_taa);
	ClassDB::bind_method(D_METHOD("set_use_debanding", "enable"), &Viewport::set_use_debanding);
	ClassDB::bind_method(D_METHOD("is_using_debanding"), &Viewport::is_using_debanding);
	ClassDB::bind_method(D_METHOD("set_use_occlusion_culling", "enable"), &Viewport::set_use_occlusion_culling);
	ClassDB::bind_method(D_METHOD("is_using_occlusion_culling"), &Viewport::is_using_occlusion_culling);
	ClassDB::bind_method(D_METHOD("set_debug_draw", "debug_draw"), &Viewport::set_debug_draw);