Using the same validation method for create and update modes

Hello, I thought I was being clever by defining a custom validation
method called validateUploadedFileExtensions which accepts a couple or
parameters. In my Image model's validation I would then reuse this
method for two rules for a model's field, like this:
'image' => array(
'imageExtension' => array(
'rule' => array('validateUploadedFileExtensions', 'image', true),
'message' => 'Invalid image extension',
'last' => false,
'on' => 'create'
),
'imageExtension' => array(
'rule' => array('validateUploadedFileExtensions', 'image', false),
'message' => 'Invalid image extension',
'last' => false,
'on' => 'update'
),
...

But, if I'm validating a collection of Image models as children to a
parent object, and some of the images are new (validating by create)
and some are updates (validating by update), only the validation for
creates are called. Is this a bug, or did they never intend for the
same validation method to be re-used like this?

Thanks in advance.

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