If you place redstone in a "staircase" shape on glowstone, the one that is not it the same Y level of the other one will not be powered.
What I expected to happen was...:
The redstone would go down
What actually happened was...:
It didn't
Steps to Reproduce:
1. Build a block "staircase
2. Put redstone on all the blocks
3. Power one piece of redstone
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Duplicate of MC-3311. This is considered a feature, as with transparent blocks (such as glowstone), the signal cannot travel downward, but can travel upward.