Okay, let me break this down for whatever batch of interns is taking eight months to fix this issue:
1) Sims are re-created from their save data every time the game loads them into a lot, including when you come back from CAS.
2) Wearing jewelry from inventory sets a flag to render it on the sim as a temporary CAS item.
3) Removing the jewelry so it can be removed from inventory should be clearing whatever flag gets set in step 2, but clearly isn't.
4) When being recreated, the game checks to see if this flagged item is still in inventory, fails to find it, searches to see if it's shelved, and obviously can't because the "shelf" isn't part of a sim's inventory.
This is a harmless LE, because the game doesn't render the jewelry the sim doesn't have, it just gets confused because the sim's attached shelf is a none-type. That error check should be removed, and the interaction to remove the jewelry should methodically un-set all the flags that get set when the jewelry is put on.
Yes, it's that simple.
Eight months.
It's not like people are paying for a working product or anything, though. So take your time.
