Scraping YouTube's first 'channelId' from HTML returns wrong channel 94% of the time

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A developer discovered that extracting the first 'channelId' value from a YouTube channel page's HTML almost always returns the wrong channel, with 15 out of 16 tested handles yielding incorrect results. The misidentified IDs belong to featured channels displayed on the page — such as @mkbhd resolving to 'The Studio' and @kurzgesagt resolving to 'Nightshift – Kurzgesagt After Dark' — rather than the target channel itself. The first 'channelId' string in the HTML is embedded inside a featured-channels shelf element, not the page's canonical channel metadata. The bug is especially deceptive because channels without a featured-channels shelf return the correct ID, making quick tests appear to validate the flawed method. The author only caught the error after publishing research based on the corrupted data, which had to be withdrawn.

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