Twitter removed the card preview from the validator tool (https://cards-dev.twitter.com/validator). That is annoying because half of the reason to use the validator tool is that it fetched fresh content from the site, which was a way to force updates on cards that needed updating. I suspect that the preview in Tweet Composer is working off of cached data and there is now no way to force an update. The announcement: https://twittercommunity.com/t/card-validator-preview-removal/175006


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