Discovered that if you shift-click items into the Redstone Logic Control GUI, the game locks and just stalls as is. Found this out with my modpack, but I tested this in a fresh instance with just this mod in it, and confirmed it's still happening.
latest.log

This is the log, but no errors seem to appear. It just... freezes.

Hi serfina, ty for the hint, I could reproduce and fix the issue - pushed to Curse (redstonepen-1.18.2-1.0.10). Cheers,-