I've never seen Kubernetes crash. I don't have that much experience with operating k8s clusters, but on those I've seen it just kept on working.
The bug caused the scheduler to get stuck meaning pods assigned to nodes kept running, but no new pods would be scheduled.
https://github.com/kubernetes/kubernetes/issues/124930
That's a pretty good track record, and indicates a level of fail-safe design (everything continued working, even though a critical components kept crashinglooping).