General views not being altered to show an item being absent aren't "bugs," it just didn't occur to them to alter that view. It's not an example of the game code not working as intended, and it doesn't affect gameplay or the flow of logic. It's something that could be improved, but much lower priority than a "bug."
Edit: I assumed that they hadn't created a side view with the magnet missing because it slipped their mind, but they actually had. You can see it update properly if you look at the side view before taking the magnet. So that actually is a bug, sorry.