Board Thread:New Features/@comment-44997843-20201009142603/@comment-9605025-20201009182148

Yes, Tupka217 meant that the new comments feature does not use MediaWiki. When converting from legacy to UCP, the message wall, article comments, and blog comments features are all switched over to use the same platform as Discussions. This new discussion platform is entirely independent of MediaWiki and doesn't even know that wikitext exists. The only thing you can do is insert plain text and use whatever formatting options the graphical interface gives you.