When redstone dust is placed next to the side of a comparator, the dust connects and the comparator uses its signal as input. However if the signal is coming from a block with redstone dust power or a repeater pointed into it, the comparator does not take the input, and just ignores it. I would expect the comparator to take the side powered block the same as it takes a signal from dust or a repeater directly into it. The images show the comparator in subtract mode to better show the problem, as a signal of 15 will turn the output off. The images show a block that is powered does not work as the side input to the comparator.
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We're tracking this issue in MC-116843, so this ticket is being resolved and linked as a duplicate.
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I think it was reported in MC-5951 and only fixed for Redstone blocks.