Hello,
Not sure if MediaWiki is the right product for this bug… It could as well be Wikimedia.
The last email notifications from frwiki I've received contain a raw $PAGEINTRO at the beginning, instead of the first sentence. It worked normally until at least 9 AM UTC on the 4th of December.
I suspect a partial merge of 494529503b41142d68d52c458a44b82577699785 or maybe a deployment of updated translations while the changeset itself was not deployed.
Best regards
Version: wmf-deployment
Severity: critical
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=42941
https://bugzilla.wikimedia.org/show_bug.cgi?id=14901