This one is super complicated, but it likely is Spec. This is why I did the Repeater as Diode Cover in the first place, so people dont receive Signals that way or loop their Inputs.
And I did fix another Bug around that time, so this might be the result of that Bugfix.
Did I mention that the Redstone System of Minecraft is utter garbage when it comes to implementation? You never know if a Redstone Dust receives power or sends it because it does both at once.