Whenever you place a piece of redstone dust on the ground and some on upside-down stairs, it doesn't connect on the wall sides but the signal will still work.
Linked issues
duplicates 1
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Confirmed for 14w18a
This was labelled as a duplicate of MC-2255. That was resolved and this bug still persists. It isn't resolved. https://i.imgur.com/X0urKYs.png
Confirmed.