### 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_READ_THREAD_GUARD_V(false);
	return physics_object_picking;
}
void Viewport::set_physics_object_picking_sort(bool p_enable) {
	ERR_MAIN_THREAD_GUARD;
	physics_object_picking_sort = p_enable;
}
bool Viewport::get_physics_object_picking_sort() {
	ERR_READ_THREAD_GUARD_V(false);
	return physics_object_picking_sort;
}
Vector2 Viewport::get_camera_coords(const Vector2 &p_viewport_coords) const {
	ERR_READ_THREAD_GUARD_V(Vector2());
	Transform2D xf = stretch_transform * global_canvas_transform;
	return xf.xform(p_viewport_coords);
}
Vector2 Viewport::get_camera_rect_size() const {
	ERR_READ_THREAD_GUARD_V(Vector2());
	return size;
}
void Viewport::set_disable_input(bool p_disable) {