Deep save associated models with relation back to first model

I have 3 models: A, B, C.

A hasMany B

A hasMany C

B hasMany C

        A
       / \
      /   \
     /     \
    |       |
    ^       ^
    B ----< C

I created the view and the controller add method.

The forms data:

$data = array(

    'A' => array(

    'id' => '',

    'name' => 'alpha',

    'B' => array(

    'id' => '',

    'name' => 'beta',

    'C' => array(

    'id' => '',

    'name' => 'gamma'

    )

    )

    )

    )

I save the forms data with the `$this->A->saveAssociated($data, ['deep' => true])` call.

If I query the newly created A model, I get the following data:

array(

    'A' => array(

    'id' => (int) 111,

    'name' => 'alpha',

    'B' => array(

    'id' => (int) 9,

    'a_id' => (int) 111,

    'name' => 'beta',

    'C' => array(

    'id' => (int) 78,

    'b_id' => (int) 9,

    'a_id' => (int) 0,

    'name' => 'gamma'

    )

    )

    )

    )

My problem is that C models `a_id` field doesnt has good value / isnt related to the newly created A model.

Is it possible to save them with one `saveAssociated($data, ['deep' => true])` call?
I think I need a way to override Cake foreign key setter method during save.

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