[COLLECTION] Objects with broken shadows

This is an older post from a few months ago that remained on the old forums about Artist Studio Kit and Storybook Nursery Kit (https://forums.ea.com/discussions/the-sims-4-bug-reports-archive-en/open-snk-ask-alpha-channels-missing-or-not-rendering-properly/11691856), but it was partially addressed as I see that backface culling has been fixed and sides appear as intended in SNK. But the shadows are still an issue, as they cast flat faces. This isn't an issue with other items that use alpha channels like windows or trees. 

Artist Studio Kit alas still has the same issue with the Studio Drape Backdrop item, where the item is essentially one-sided, and the back of it casts no shadows. Whilst looking for the items, I've noticed that the Crafted Coverings curtain from High School Years also casts no shadow, unlike its short wall counterpart (Woven Wonder Drapes). 

So ultimately I've decided to try and find a few more items that have wrong/no shadows that would be noticeable indoors, such as curtains or windows.