Comparators appear as powered when put into subtraction mode.

When a comparator is toggled into subtraction mode, all three of the torches appear lit. The back two appear as lit even if the comparator is not being currently powered. Toggling main input with a redstone signal will then turn the back torches off, however when the comparator mode is toggled, the problem appears again. The NBT data also shows the comparator to be powered even though it is not.