I think it is a mis-label or maybe a mutation?? Foliage looks like holly. Hooked prickles. Stiff stems. Wider petals And an almond-toned white.

In contrast, Iceberg usually has spender buds, tapered, clean white blooms. Foliage is also tapered, and the stems are typically slender.

I actually am more curious what the rose in the photo is, than I am about about it not being Iceberg. It's like French Lace, but it isn't French Lace (I think?).

Misty – You have uploaded specific and named roses into your garden file. If ever anyone wants to see such photos of ‘Masquerade’ changing colour, they will never find them there. Ideally the garden file should be only used for your overall garden photos - which we would love to see. You have the facility to move your photos, but if you wish, we can do it for you.