The legend for changes is not displayed normal (totally unstyled by js) if a non-existing page is specified.
Diffing the html-output shows that mediawiki.special.changeslist and mediawiki.special.changeslist.enhanced are not requested from resource loader.
Manually executing "mw.load('mediawiki.special.changeslist');" restores the expected design.
Not a big deal. As far as I see it won't normally occur to users unless they manually type in by mistake a page title which doesn't exist.
example: https://en.wikipedia.org/w/index.php?target=WP%3Aafiow&title=Special%3ARecentChangesLinked
expected: https://en.wikipedia.org/w/index.php?target=WP%3AABF&title=Special%3ARecentChangesLinked
Version: 1.23.0
Severity: trivial
URL: https://en.wikipedia.org/w/index.php?target=WP%3Aafiow&title=Special%3ARecentChangesLinked