After 20w18a when they have made redstone a lot more consistant, RayWorks found 1 inconsistancy in his video. the redstone dust appears to be pointing upwards but does not power the piston above it. I took a screenshot from his video. Although in the screenshot the upwards pointing redstone didn't power the redstone dust above, this can be reproduced by having the bottom redstone have a signal strength of 1.
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duplicates 1
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This is an invalid state of redstone dust, thus this is not a valid bug.
It is only possible to obtain a redstone dust going upwards without another dust connected to it using other bugs or the debug stick.
This can still be achieved by valid states: MC-181818
Duplicate of MC-181512
Seconded, can be reproduced using a similar setup to one of the changes shown in the blog post.