I don't have a scientist in my current save but do have a doctor. I'm not experiencing homework books disappearing with that career. Her spouse is in the Astronaut career, so that career doesn't seem to be affected either. Also will point out that I don't have multiple children in that household, only one who is now a teen, so I can't say for sure whether or not having both child and teen stages present might have caused a different result.
I don't think this bug is related to any special career, but I can confirm that it happens occasionally. Some weeks ago I had to buy my teenage Sim new homework every day for a week. I never saw how the book disappeared - it may also happen on the table like the table sets from Parenthood. People on the forum are also complaining about this.
