neowin[.]net/news/microsoft-investigates-windows-kb5029351-kb5029331-unsupported-processor-blue-screens/
bleepingcomputer[.]com/news/microsoft/new-windows-updates-cause-unsupported-processor-blue-screens/
This month's optional update doesn't do or add much IMHO, so I think most will skip it, waiting instead for September's Patch Tuesday, when it will be included. But, some of those who did opt to install it are experiencing BSOD crashes with an error message that says: "UNSUPPORTED_PROCESSOR", despite their CPUs actually being supported. Microsoft doesn't yet know why, and is asking that anyone experiencing this fill out a report via the Feedback Hub.