When placing redstone dust, it will sometimes appear distorted or even invisible, but it still carries a current properly and the particles appear normal when the redstone is powered. However, the hitbox appears to be correct despite the graphical errors. I encountered the problem on both fast and fancy graphics.
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Already fixed MC-66970 in 14w33b

Oops! My launcher didn't show 33b right away so I assumed 33a was most recent. Sorry!