- Open https://www.wikidata.org/wiki/Q16943273
- Try to add any sitelink to any already linked page
You will see a detailed error message. This may include AbuseFilter warning or disallow message.
- You only see "The save has failed."
- The message is not localized. (T250889)
At least seen since Feb 24: https://www.wikidata.org/wiki/Wikidata:Project_chat/Archive/2020/02#How_to_edit_label?