as said, a redstone comparator in the subtraction state that should not be giving off a signal is still locking the repeater in front of it.
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Also happens with a torch going into a repeater going into the side of the comparator, but not with the torch directly next to the comparator (that causes actual locking).
This was fixed, but caused another bug: MC-9194.
Confirmed in 13w02b, but seems to be just a graphical glitch, as the comparator does not really lock the repeater.