Wikidata item https://www.wikidata.org/wiki/Q25670 is connected to https://en.wikiversity.org/w/index.php?title=Digital_object_identifier. That page was deleted in december 2019.
If you have another page https://en.wikiversity.org/wiki/Draft:Metadefinitions in your watchlist on enwikiversity, and have enabled "Show Wikidata edits in your watchlist" in your preferences, then updates to Q25670 will be shown in your watchlist for the page Draft:Metadefinitions like this:
(diff | hist) . . D Draft:Metadefinitions (Q25670); 12:50 . . MichelBakni (discuss | contribs) (Language link changed from arwiki:معرف الأغراض الرقمية to arwiki:معرف الغرض الرقمي)
This was reported on https://www.wikidata.org/wiki/Wikidata:Project_chat#D_links_on_my_Wikiversity_Watchlist, and I have confirmed the issue.