https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-emergency-updates-to-fix-xps-display-issues/ > Microsoft has released out-of-band (OOB) updates for some .NET Framework and .NET versions to address XPS display issues triggered by December 2022 cumulative security updates. > Users will experience null reference exceptions and images or glyphs displaying incorrectly when viewing XPS documents rendered using affected Windows Presentation Foundation (WPF) based apps.