You can roll back to a backup right before the OS update that caused the bug. For example I have hourly snapshots using btrfs. Each snapshot is entirely bootable by itself, so if I ever broke anything, I just roll back. The system snapshots are read-only, so they are unlikely to be destroyed by bugs like that. You can also just make another snapshot of the same snapshot to be safer. It's also separate from the user data I care about.