Since, I presume, the patch(es) in T207313 have been deployed, the column in Wikidata's recentchanges SQL table holding edit summaries has no longer been populated, which is problematic for those who wish to rely on such summaries.
My presumption of when the problem began comes from the results of https://quarry.wmflabs.org/query/25116, a list of changes to stuff on Wikidata in Bengali, which ideally shouldn't have stopped abruptly on October 23rd (around the time the aforementioned patches were deployed), and https://quarry.wmflabs.org/query/31314, a list intended to be of specifically Bengali label additions, which presently reports nothing in the rc_comment column.