### Godot version

v4.2.dev.custom_build [c3b0a92c3]

### System information

Debian Linux X11 Xfce

### Issue description

In the following scene tree it is not possible to write anything in `LineEditB`.
![image](https://github.com/godotengine/godot/assets/6299227/ce5f696a-d86a-402f-98f7-6a762f15543e)

I would expect, that it is possible to focus `LineEditB` with a mouse click and write into it.

Regression from #58334

### Steps to reproduce

1. Load and run MRP
2. Mouse Click into the left LineEditB
3. Type Keyboard => No letters appear in the LineEditB

Variant:

1. Load and run MRP
2. Mouse Click into the right LineEditA
3. Mouse Click into the left LineEditB
4. Type Keyboard => Letters appear in LineEditA instead of LineEditB


### Minimal reproduction project

[BugKeyInputRouting.zip](https://github.com/godotengine/godot/files/11994804/BugKeyInputRouting.zip)

ERR_MAIN_THREAD_GUARD;
	if (texture_mipmap_bias == p_texture_mipmap_bias) {
		return;
	}
	texture_mipmap_bias = p_texture_mipmap_bias;
	RS::get_singleton()->viewport_set_texture_mipmap_bias(viewport, p_texture_mipmap_bias);
}
float Viewport::get_texture_mipmap_bias() const {
	ERR_READ_THREAD_GUARD_V(0);
	return texture_mipmap_bias;
}
#endif 
void Viewport::_propagate_world_2d_changed(Node *p_node) {
	if (p_node != this) {
		if (Object::cast_to<CanvasItem>(p_node)) {
			p_node->notification(CanvasItem::NOTIFICATION_WORLD_2D_CHANGED);
		} else {
			Viewport *v = Object::cast_to<Viewport>(p_node);
			if (v) {
				if (v->world_2d.is_valid()) {
					return;
				}
			}
		}
	}
	for (int i = 0; i < p_node->get_child_count(); ++i) {
		_propagate_world_2d_changed(p_node->get_child(i));
	}
}
void Viewport::_bind_methods() {