"Order has a product with a particular attribute option" is unreliable

Have already changed the label name in lowercase, but that didnt't help. Changing it to "none" either.

$attribute dump:

stdClass Object
(
    [aid] => 2
    [name] => print size
    [label] => <none>
    [ordering] => 0
    [required] => 1
    [display] => 1
    [description] => Select printing size & type
    [options] => Array
        (
            [9] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 9
                    [name] => Fine Art print 30x45cm
                    [cost] => 0.00000
                    [price] => 69.95000
                    [weight] => 1
                    [ordering] => -50
                )

            [10] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 10
                    [name] => Fine Art print 40x60cm
                    [cost] => 0.00000
                    [price] => 89.95000
                    [weight] => 1
                    [ordering] => -49
                )

            [11] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 11
                    [name] => Fine Art print 50x75cm
                    [cost] => 0.00000
                    [price] => 109.95000
                    [weight] => 1
                    [ordering] => -48
                )

            [12] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 12
                    [name] => Fine Art print 70x100cm
                    [cost] => 0.00000
                    [price] => 149.95000
                    [weight] => 1
                    [ordering] => -47
                )

            [5] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 5
                    [name] => Canvas 40x60cm
                    [cost] => 0.00000
                    [price] => 175.00000
                    [weight] => 2
                    [ordering] => -46
                )

            [6] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 6
                    [name] => Canvas 60x90cm
                    [cost] => 0.00000
                    [price] => 225.00000
                    [weight] => 2
                    [ordering] => -45
                )

            [7] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 7
                    [name] => Canvas 80x120cm
                    [cost] => 0.00000
                    [price] => 300.00000
                    [weight] => 3
                    [ordering] => -44
                )

            [8] => stdClass Object
                (
                    [aid] => 2
                    [oid] => 8
                    [name] => Canvas 100x150cm
                    [cost] => 0.00000
                    [price] => 375.00000
                    [weight] => 4
                    [ordering] => -43
                )

        )

)

$attributes dump:

Array
(
    [Print size] => Array
        (
            [9] => Fine Art print 30x45cm
        )

)

I fixed it temporarily by adding a ucfirst, but that is of course not the way to solve it. Bumped into another issue too: when combining mutiple conditions with "OR' to check for specific attributes it seems to return "false" again.

Changed the label at product attribute level, but that doesn't change anything. I have tried "print size" lowercase or even <none>, but the attributes array keeps using "Print size" capitalized like in the array dump in my previous post.

The bug has to do something with $attributes = $product->data['attributes'];

The value of $product->data['attributes'] says "Print size" nomatter what I use as labels or name for the attributes.