I was building an elevator using ED and Create blocks, but I noticed that these two blocks do not connect each others
Here is an image:

Salute! Aye, the fences connect to solid block sides only. You have a good point here, what may be needed here is a kind of wall-like centred panel to allow the door to slide in.

Let me transfer this issue to note in my todo-book for this, so that it's taken into account for new features. Cheers!