Photoshop :: Transformation Of Filter Masks

When I transform a smart object, its filter mask doesn't get transformed as well. The same holds true for the mask for the smart object itself, but one can put the smart object into a group and add the mask to the group as a workaround.
But what should I do with the filter mask ? The only workaround I was able to think of, was to copy the filter mask to another layer in the same group as the smart object, transform the whole group and put the filter mask back to its original place. But I can hardly imagine that this is the suggested way to work by Adobe, or is it?

All I could find in the help is this:

> By default, layer masks are linked to regular layers. When you move the layer mask or the layer using the Move tool, they move as a unit. Masks applied to Smart Object layers, including filter masks, arent linked to layers. If you move a filter mask or a layer using the Move tool, they do not move as one unit.