Fences and walls connect to closed shulker boxes

It's a full cube though, so wouldnt that make sense?

I think it completely made sense, and should not have been fixed, since I think it's not a bug (It's a feature!).

I found this earlier than this report, but I thought it wasn't a bug, since it completely made sense. It was perfect for launching traps when combined with an observer. 

Why would you "fix" this feature?