By replacing "FREE_640" with "FREE_1920" you force webserver to upscale such middle size image to 1920px width, that makes it too large for IV. Many articles won't generate an IV page due to this issue.
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https://medier.talentum.com/ponIltIpIv-1507883681/media/Nyteknik/rmu7iv-quiz-ny-teknik/alternates/FREE_1920/quiz-ny-teknik
By replacing "FREE_640" with "FREE_1920" you force webserver to upscale such middle size image to 1920px width, that makes it too large for IV. Many articles won't generate an IV page due to this issue.