This bug is best demonstrated in the video attached.
There appears to be an inconsistency to which blocks receive power when positioned under a top half slab (or other transparent block on which redstone is able to be placed), with active redstone ontop of it.
The expected behavior would be that no block positioned under the transparent block would be powered, however Droppers, Dispensers and Pistons do activate, while all other blocks, such as redstone lamps, trapdoors etc. don't.
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Duplicates MC-108

Thank you for your report!
We're tracking this issue in MC-108, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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