The specific article that produces ⧼cx-error-page-not-found⧽ was reported in cx-error-page-not-found topic.
Start translating an article from jawiki to cawiki the article https://ja.wikipedia.org/wiki/%E6%98%9F%E3%81%AB%E9%A1%98%E3%81%84%E3%82%92%E3%80%82
ContentTranslation page displays ⧼cx-error-page-not-found⧽:
Request URL: https://cxserver.wikimedia.org/v1/page/ja/%E6%98%9F%E3%81%AB%E9%A1%98%E3%81%84%E3%82%92%E3%80%82 Request Method: GET Status Code: 404
Page ja:星ã«é¡˜ã„を。 could not be found. TypeError: Cannot read property 'about' of null
I tried different articles in jawiki: https://ja.wikipedia.org/wiki/%E5%80%89%E7%9F%A5%E9%89%84%E5%90%89 and https://ja.wikipedia.org/wiki/%E6%85%88%E6%81%B5%E5%AE%9F%E6%A5%AD and from zhwiki: https://zh.wikipedia.org/wiki/%E9%BE%99%E5%B1%B1%E9%95%87_(%E9%BE%99%E9%99%B5%E5%8E%BF) and https://zh.wikipedia.org/wiki/%E6%9C%BA%E5%99%A8%E4%BA%BA -- the error is no displayed and translation works as expected.