### 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)

GDCLASS(SubViewportContainer, Container);
	bool stretch = false;
	int shrink = 1;
	void _notify_viewports(int p_notification);
	bool _is_propagated_in_gui_input(const Ref<InputEvent> &p_event);
	void _send_event_to_viewports(const Ref<InputEvent> &p_event);
protected:
	void _notification(int p_what);
	static void _bind_methods();
	virtual void add_child_notify(Node *p_child) override;
	virtual void remove_child_notify(Node *p_child) override;
public:
	void set_stretch(bool p_enable);
	bool is_stretch_enabled() const;
	virtual void input(const Ref<InputEvent> &p_event) override;
	virtual void gui_input(const Ref<InputEvent> &p_event) override;
	void set_stretch_shrink(int p_shrink);
	int get_stretch_shrink() const;
	void recalc_force_viewport_sizes();
	virtual Size2 get_minimum_size() const override;
	virtual Vector<int> get_allowed_size_flags_horizontal() const override;
	virtual Vector<int> get_allowed_size_flags_vertical() const override;
	PackedStringArray get_configuration_warnings() const override;
	SubViewportContainer();
};
#endif