This multilingual post has versions in Japanese and Hebrew that were properly connected via the usual "This post is available in 3 languages:" bar on top
at the time of publication. However, the bar is missing as of today. And the version history in WordPress for either of the three language versions shows no edits afterwards, so it does not look like an error by a blog editor.
The Post Meta Inspector in both the Hebrew and the Japanese version indicates they should still be connected properly to the English version:
(35476 is the post number of the English version, as it should be.)
I have observed the same phenomenon some weeks ago in two other posts (however, they look OK again right now). And Fabrice and Andrew just reported what looks like the same problem for the "Hindi Wiki Sammelan" post (English / Hindi, although there the "This post is available in 2 languages" bar is still visible in the English version, it just misses the link to the Hindi version).