ContentTranslation doesn't adapt {{cite web}} when translating from Bengali to English.
Example: the first reference in https://bn.wikipedia.org/w/index.php?title=%E0%A6%97%E0%A7%81%E0%A6%A3%E0%A6%AC%E0%A6%A4%E0%A7%80_%E0%A6%87%E0%A6%89%E0%A6%A8%E0%A6%BF%E0%A6%AF%E0%A6%BC%E0%A6%A8&action=edit&oldid=1903590
T147542 is probably related to this issue. But the link in the description of this ticket needs more information around it to better describe the problem.
Sorry, that link was indeed not so useful. I improved it with a link to the relevant revision at the day of the report (as I'm usually doing these days).
That said, it's a fairly general issue, and all the bugs off this kind must be retested after deploying the template changes (T139332).
In general, adapting {{cite web}} from a bn article to an en article works in CX2.
However, while testing today, I noticed that the original article had strange wiki syntax: <ref name=>. Maybe that's the reason the bug was occurring? And maybe it still happens? Can anybody test, please?