Everyone is assuming it’s some intern pushing a release out accidentally or a lack of QA but Microsoft also pushed out July security updates that have been causing bsods on the 9th(?). These aren’t optional either.
What’s the likelihood that the CS file was tested on devices that hadn’t got the latest windows security update and it was an unholy union of both those things that’s caused this meltdown. The timelines do potentially line up when you consider your average agile delivery cadence.