Named parameters, forms and redirects

I'm passing a foreign id to my models add funtion via a URL such as

/model/add/foreign_id:1

The /add/ method generates an error and redirects if it does not
receive this parameter.

I assign the foreign id to the model and it auto populates the form

if(isset($this->passedArgs['foreign_id']))
$this->data['model']['foreign_id'] = $this->passedArgs['foreign_id'];

This all works, until the form has a validation error and has to be re-
displayed to the user. The URL then changes to

/model/add/

So the foreign_id information is then lost.

Firstly, is what I'm doing correct, and how can I fix this issue?

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