See e.g. https://incubator.wikimedia.org/w/index.php?title=Category:Wp/ady/%D0%90%D0%B4%D1%8B%D0%B3%D1%8D_%D0%A0%D0%B5%D1%81%D0%BF%D1%83%D0%B1%D0%BB%D0%B8%D0%BA%D1%8D%D0%BC_%D0%B8_%D0%BF%D1%81%D1%8B%D1%85%D1%8D%D1%80&action=edit "This wiki already exists. You can find this page on [/wiki/Category:Адыгэ_Республикэм_и_псыхэр wiki/Category:Адыгэ_Республикэм_и_псыхэр]. If the wiki was recently created, please wait a few hours or days until all content is imported." (The message is wminc-error-wiki-exists).
Example: https://incubator.wikimedia.org/wiki/Wp/war/MediaWiki:Common.js
<div class="wminc-wiki-exists">This wiki already exists. You can find this page on <a class="external" rel="nofollow" href="/wiki/MediaWiki:Common.js">wiki/MediaWiki:Common.js</a>. If the wiki was recently created, please wait a few hours or days until all content is imported.</div>