I'm not sure whether it's user error or an actual bug, but:

• multipart luminators don't seem to illuminate (unlike normal ones which work as intended)
• when breaking a multipart luminator on a glass fibre cable block, only the cable drops, so you lose the multipart luminator item. You can still get it with a wrench, but this behavior is inconsistent with the normal, non-multipart luminator, which doesn't require a wrench.