Board Thread:Support Requests - Getting Technical/@comment-29883180-20201021170620/@comment-9605025-20201021171132

Because UCP is significantly different from the legacy platform, there are a lot of customizations that won't just carry over without some updating. The script you are talking about has not yet been updated to work with UCP. You can keep an eye on its UCP-readiness by checking the documentation page on the Fandom Developers Wiki. You can also see a list of scripts and their statuses at Project:UCP on the Fandom Developers Wiki.