### 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;
	bool request_update = gui.canvas_parents_with_dirty_order.is_empty();
	gui.canvas_parents_with_dirty_order.insert(p_node->get_instance_id());
	if (request_update) {
		MessageQueue::get_singleton()->push_callable(callable_mp(this, &Viewport::_process_dirty_canvas_parent_orders));
	}
}
void Viewport::_update_audio_listener_2d() {
	if (AudioServer::get_singleton()) {
		AudioServer::get_singleton()->notify_listener_changed();
	}
}
void Viewport::set_as_audio_listener_2d(bool p_enable) {
	ERR_MAIN_THREAD_GUARD;
	if (p_enable == is_audio_listener_2d_enabled) {
		return;
	}
	is_audio_listener_2d_enabled = p_enable;
	_update_audio_listener_2d();
}
bool Viewport::is_audio_listener_2d() const {
	ERR_READ_THREAD_GUARD_V(false);
	return is_audio_listener_2d_enabled;
}
AudioListener2D *Viewport::get_audio_listener_2d() const {
	ERR_READ_THREAD_GUARD_V(nullptr);
	return audio_listener_2d;
}
void Viewport::enable_canvas_transform_override(bool p_enable) {