Ukrainian Wikipedia currently has a Sitenotice and an Anonnotice with links to https://uk.wikipedia.org/wiki/Вікіпедія:Війна and https://uk.wikipedia.org/wiki/Вікіпедія:Війна/Ресурси respectively.
While the latter works fine, I have noticed that the link in the first now renders as a self-link (does not link anywhere, is marked with mw-selflink selflink classes). On the MediaWiki page itself it shows fine. Null edit did not help.
I could not reproduce it on testwiki by making a new link in its Sitenotice.
Note: it seems to have self-fixed, updated to past tense, but will leave this open in case someone wants to investigate