Harry Eisenberg’s Jeopardy book mentions something like this. In the first couple seasons of Trebek’s run, they had a clue about a certain newspaper in a major city (maybe St. Louis?) no longer being in publication. Between taping and airing, the newspaper resumed publication and the show got lots of letters about their info being incorrect. So they decided to do an apology of sorts in a later episode. There was a clue about the paper again, this time mentioning that it had resumed publication. But by the time that episode aired, the paper had gone out of publication again.
The St. Louis Globe-Democrat filed for bankruptcy in September 1985 and announced it would stop publishing, but apparently managed to hang on until December 1985, when it
did stop publishing for about a month, whereupon a new owner took over and resumed publication... until October 29, 1986, when it ceased publication for good.
Thanks to J-Archive, here are the relevant J! clues and dates:
November 21, 1985: What N.Y. World-Telegram & Sun, St. Louis Globe-Democrat & Wash. Star currently have in common (correct response: no longer being published)
December 29, 1986: Though they twice announced they would be folding, the Globe-Democrat is alive & well in this city
September 9, 1987 (in a category called OOPS!): When "Jeopardy!" said this city's "Globe-Democrat" was folding, it thrived; when we said it was okay, it folded