I've noticed that bug while distributing Tech News, where a link using `|` was in 2018/29 issue. I can't properly distribute the issue while it is impacting all StructuredDiscussions users.
Check on the 3re bullet point of [[https://fr.wikipedia.org/wiki/Sujet:Uh0okq13t5h1e90f|that message]]: the "cartes v2" link goes nowhere. It is supposed to go to https://stats.wikimedia.org/v2/#/fr.wikipedia.org/reading/page-views-by-country/normal|map|2-Year~2016060100~2018071100|~total (note vertical bars in the URL).
The source for that message is
`[https://stats.wikimedia.org/v2/#/fr.wikipedia.org/reading/page-views-by-country/normal{{!}}map{{!}}2-Year~2016060100~2018071100{{!}}~total cartes Wikistats2] `
On unstructured talk pages, the same code [[ https://ko.wikipedia.org/w/index.php?title=%EC%82%AC%EC%9A%A9%EC%9E%90%ED%86%A0%EB%A1%A0:Trizek_(WMF)&oldid=21789735 | renders correctly ]].
That {{!}} alternative is on all wikis while it is a magic word alternative [[ https://www.mediawiki.org/wiki/Help:Magic_words#Other | since Mediawiki ≥ 1.24 ]].