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I'm in bus atm. Will take a look in five hours or so. Maybe sooner if I can get my laptop out.
Looking at the database, rc_comment in field is the same everywhere, so either: 1- This issue has not been introduced recently (and users started to report it now) which is unlikely OR 2- ChangeLinkFormatter (or Linker::formatComment) introduced this regression. Looking in it more depth atm.
Change 409622 had a related patch set uploaded (by Ladsgroup; owner: Amir Sarabadani):
[operations/mediawiki-config@master] Add federation-related configs for clients
After several hours of looking at codes, trying to reproduce it and interesting revelations such as RC injection is completely broken on beta, I think this will help getting the issue handled. It might not. I will deploy this on Monday and check the status.
Change 410133 had a related patch set uploaded (by WMDE-leszek; owner: WMDE-leszek):
[mediawiki/extensions/Wikibase@master] Use backwards-compatible settings for changesDatabase and repoSiteId