Description of the issue:

The wires don't show unless you force a block update by placing something next to it and removing it, or you re-connect. Image shows both side connected, but the left side was updated before placing the right.
https://i.imgur.com/37gAfFG.png

EDIT: I've also noticed F3+A (chunk render refresh) does work too.

Versions & Modlist

ImmersiveEngineering-0.12-92
https://paste.dimdev.org/hugawalepa.mccrash

I've tested without the most obvious potential issue mod Optifine, and the issues persists.