User blog comment:MisterWoodhouse/The first Unified Community Platform release is now live for NEW wikis/@comment-1998339-20200313113046/@comment-162360-20200313132740

I see missing categories as redlink on published articles, only in the preview they are shown as bluelinks. Do you see 3 categories (at the following article as redlink ? Akheva Runes The current 3 red links:
 * The Blinding Collection Quests
 * Aurelian Coast Collection Quests
 * Wracklands Collection Quests

If you don't see them as redlink try the following: Preferences -> first tab "My Info" and change "Category page layout" to "Classic Categories"