Scroll View Viewport not clipping Image elements with materials

Hi there,

I am trying to make a scrollable list of color swatches. But I want some of them to be 'metallic' I can achieve this by adding a standard material to my swatch that has a 'spherical' normal map on it.

However using *any* material on my swatch makes it not get clipped by the 'Viewport' of the 'Scroll View' element it is in:-
View attachment 164438
You can see that the other swatches are getting clipped just fine but that the 'Gold' one is not.

What can I do to make this...

Scroll View Viewport not clipping Image elements with materials