### 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)

case SUB_WINDOW_RESIZE_TOP: {
						diff.x = 0;
						diff.y = MIN(diff.y, limit.y);
						r.position += diff;
						r.size -= diff;
					} break;
					case SUB_WINDOW_RESIZE_TOP_RIGHT: {
						diff.x = MAX(diff.x, -limit.x);
						diff.y = MIN(diff.y, limit.y);
						r.position.y += diff.y;
						r.size.y -= diff.y;
						r.size.x += diff.x;
					} break;
					case SUB_WINDOW_RESIZE_LEFT: {
						diff.x = MIN(diff.x, limit.x);
						diff.y = 0;
						r.position += diff;
						r.size -= diff;
					} break;
					case SUB_WINDOW_RESIZE_RIGHT: {
						diff.x = MAX(diff.x, -limit.x);
						r.size.x += diff.x;
					} break;
					case SUB_WINDOW_RESIZE_BOTTOM_LEFT: {
						diff.x = MIN(diff.x, limit.x);
						diff.y = MAX(diff.y, -limit.y);
						r.position.x += diff.x;
						r.size.x -= diff.x;
						r.size.y += diff.y;
					} break;