### 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 (camera_3d_override) {
		if (camera_3d_override.size == p_size && camera_3d_override.z_near == p_z_near &&
				camera_3d_override.z_far == p_z_far && camera_3d_override.projection == Camera3DOverrideData::PROJECTION_ORTHOGONAL) {
			return;
		}
		camera_3d_override.size = p_size;
		camera_3d_override.z_near = p_z_near;
		camera_3d_override.z_far = p_z_far;
		camera_3d_override.projection = Camera3DOverrideData::PROJECTION_ORTHOGONAL;
		RenderingServer::get_singleton()->camera_set_orthogonal(camera_3d_override.rid, camera_3d_override.size, camera_3d_override.z_near, camera_3d_override.z_far);
	}
}
void Viewport::set_disable_3d(bool p_disable) {
	ERR_MAIN_THREAD_GUARD;
	disable_3d = p_disable;
	RenderingServer::get_singleton()->viewport_set_disable_3d(viewport, disable_3d);
}
bool Viewport::is_3d_disabled() const {
	ERR_READ_THREAD_GUARD_V(false);
	return disable_3d;
}
bool Viewport::is_camera_3d_override_enabled() const {
	ERR_READ_THREAD_GUARD_V(false);
	return camera_3d_override;
}
void Viewport::set_camera_3d_override_transform(const Transform3D &p_transform) {