Mod versions

• Minecraft Forge 1.12.2 14.23.4.2749
• SimpleLogic Wires and CharsetLib 0.5.4.6
• MCMultipart 2.5.1

Reproduction steps

1. Setup a redstone lamp, redstone cable, insulated cable and a lever as so:
2. Break the redstone cable on the lamp, leaving the insulated cable intact. Observe the lamp remains on
3. Turn the lever off, or break it. Note the lamp remains on, despite there being no redstone signal. Triggering a block update fixes it.

I'm afraid I haven't looked too deeply into the code, so don't want to make a diagnosis - this is no #244. Sorry!

Thanks for the bug report anyway! I pretty much know what's wrong, and this should be an easy fix. Scheduled for 0.5.4.7/0.5.5.