Comment 3 for bug 518768

reproduced with Inkscape 0.47 r 22583 and 0.47+devel r9066 on OS X 10.5.8

I think it is the same underlying issue (interpolate fails to take an explicit 'transform' attribute into account): shapes like ellipses, stars, polygons and spirals do keep a (preserved) 'transform' attribute - no matter whether the 'Transform' preference is set to 'optimized' or 'preserved' (see bug #233935 “Moves of circle stored in transform Attribute”).