Topic on Category talk:Event
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As a workaround, I installed a URL shortener on the wiki : Special:UrlShortener.
You can try with this link, normally this should work: [].
Why would it works where other shorteners failed? I think that's because other shorteners make a permanent redirection (code 301), while with my url shortener, I make a temporary redirection (code 302). It seems that, when it is a permanent redirection, NextCloud chooses to use the target url instead, that is, the long url.