Graph Extension can't support Japanese, see JaWikipedia page : https://ja.wikipedia.org/w/index.php?title=%E5%88%A9%E7%94%A8%E8%80%85:%E7%B5%84%E6%9B%B2%E5%B8%AB/sandbox2&oldid=59868466 , but in edit preview mode Japanese is ok.
Resemble cace : T98836