After installing the SharePoint 2019 KB5001945 Security Update, today all document libraries and lists show nothing but a blank page. This occurs even on the Central Admin site. Does anyone know the best way to fix it? Should we roll-back the CU? Anyone is facing the same issue?
According to this article,
It is required to install both fixes (language dependent and independent) to fully patch a SharePoint server.
Have you installed both two fixes? Please install both fixes.