Transparent blocks that can have redstone placed on them (hoppers, glowstone, upside down slabs and stairs) only receive level one power when they should be getting level two. They themselves will be powered, but they will not power adjacent blocks.
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Normal transparent blocks don't. However, hoppers and glowstone are different in that they can have redstone placed on them, and (in the case of hoppers at least) will receive power.
I disagree. I understand it works that way now, but I don't think it should. Hoppers and glowstone already act differently. I think we should wait on Mojang to decide whether this is intended or not.
Non-solid blocks have never been able to be powered. This also affects slabs and stairs, by the way. Previously, running a line of redstone up to a block of glowstone from the side with a dispenser on the other side did not activate the dispenser (unless you go back to when glowstone was a solid block). It's always been this way. Requesting it to be changed makes this a feature request.
I think this isn't a bug. Transparent blocks (non-opaque) like the two you named are unable to transmit redstone signals. Try this with a glass block being directly powered by a redstone repeater facing it - tell me if it does anything.