SharePoint Server 2019 September 2020 Public Update Bug

For the SharePoint Server 2019 September 2020 language-specific update KB4484504, there is an issue with non-English languages and Modern sites. On modern sites, the Site Contents and Command Bar in Lists/Libraries is not rendering. A case was opened and the bug was confirmed.

My recommendation for non-English farms is to hold off on the September 2020 PUs for SharePoint Server 2019 at this time.

Trevor Seward is a Microsoft Office Apps and Services MVP who specializes in SharePoint Server administration, hybrid scenarios, and SharePoint Online. He has been working with SharePoint for 16 years from SharePoint 2003 on up, managing environments with terabytes of content for 150,000+ user organizations. Trevor is an author of Deploying SharePoint 2016 and Deploying SharePoint 2019. You can find him on Twitter and in /r/sharepoint.