Containable behavior and dual model relationship

I'm having some trouble using Containable with the following model
relationship.

Suppose an Airplane has two EngineTypes, with the relationships
defined like this:

class Airplane extends AppModel {
$belongsTo = array(
'EngineType' => array(
'className' => 'EngineType',
'foreignKey' => 'engine_type_id',
),
'SecondEngineType' => array(
'className' => 'EngineType',
'foreignKey' => 'second_engine_type_id',
),
);
}

I can't get my Airplane model to return the associated
SecondEngineType info using Containable behavior:

$this->Airplane->find( 'all', array(
'contain' => array(
'EngineType',
'SecondEngineType',
),
);

The first EngineType shows up, but not the SecondEngineType.

When I do a normal recursive find on Airplane, I get both.

So, I'm fairly sure this is something to do with the Containable
behavior, but I can't figure it out.

Any thoughts?

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