Redstone dust does not update to powered texture when it's powered by 1 tick pulse generator through pistons as shown in the video (direction of build doesn't matter). The redstone is actually powered and can be used but it just doesn't update to powered state as a texture during the time that it should. It does update in texture via observers though.
I'm not sure from what version this occurs from but i didn't experience this in the past and it isn't due to the world.
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G4me4u
The dust shown in the video is actually not a 1 tick pulse. The dust is powered by the repeater through the block, however, the block is moved away by the piston in the same gametick (just later). So this pulse is what's known as a zero tick and the power persists logically and visually for less than a frame. This is not a valid bug.
SunCat
Thank you for your report!
However, this issue is a Duplicate of MC-8328.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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SunCat
@unknown it is a dupe of a valid bug, see MC-8328