Ok, you found a way to go around power=generator, but that's just a loophole. How would you go around highway=path+bicycle=designated+foot=designated+segregated=yes? If you leave out just one of those tags, it changes the resulting meaning. What's your solution? Just leave out Q221722 altogether? As OSM matures, number of various combinations of tags with distinct meanings will only be higher.
Making a Wikidata list of tags without combinations is an OK reference, but it will newer be complete.
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