I recently created a new wiki but to my surprise a lot of things were different compared to the old wikis I worked on for example some of the souce codes I used for the older wiki that worked fine didn't seem to work on the new one, there was no Blogs Posts or comment section on a page (none that I can find) and the edit bar and stuff looked different
Starting March 11, 2020, new wikis use the Unified Community Platform (UCP). Fandom has also started to convert some older wikis to UCP. UCP wikis currently have less functionality than pre-UCP wikis and are missing many legacy features. Fandom is continuing to work on adding/porting some missing features. For a user-compiled list of bugs, please see this page.