Bug in relation HasOneThrough

[doox911]

Russian version

$shape = Position::with('shape')->find($position_id)->shape;
$copy_shape = $shape->replicate();
$copy_shape->save();

Получаю модель через отношение HasOneThrough. Затем, сохраняю копию модели (метод replicate()) . А затем сохраняю эту копию, то получаю ошибку:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'laravel_through_key' in 'field list' (SQL: insert into `shapes..` 

1. Зачем необходимо св-во laravel_through_key?
2. Почему это свойство не игнорируется при сохранении?

English version

I get the model through the relation HasOneThrough. Then, I save a copy of the model (method replicate ()). And when I save this copy, I get an error:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'laravel_through_key' in 'field list' (SQL: insert into `shapes..` 

Laravel version is 7.4.0

1. Why is laravel_through_key necessary?
2. Why is this property not ignored when saved?

[jmarcher]

You could remove the with('shape') part or just do $copy_shape = $shape->fresh()->replicate(); I believe that should work.