Pretty simple bug. I had a button on soulsand, clicked it, and no redstone output was detected. I tried the same with powered redstone going into soulsand with a repeater as an output, still nothing. I tried the same setup, identical except for the soulsand with a different block and it worked fine.
Sorry if this is intended (:
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I knew something was up when I loaded a superflat world with soul sand as the top layer, and only hostile mobs spawned. They shouldn't even be spawning on transparent blocks. That probably means soul sand being "transparent" is unintended.
Intended, soul sand is considered transparent.