Filing as bug as it's a week now.
Gerrit change 67531 was merged (and deployed, according to Chad), but it wasn't enough; probably thanks to gerrit change 68110, it now works for core; but extensions are still broken.
Example: https://git.wikimedia.org/commitdiff/mediawiki%2Fextensions%2FWikibase/127c6953860a41a8a03d73f97814f13855dee51e but old translation at [[d:MediaWiki:Wikibase-comment-update/nb]]
Version: unspecified
Severity: critical
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=38383
https://bugzilla.wikimedia.org/show_bug.cgi?id=50433