Comment 15 for bug 1987190

This caused me a major headache and a lot of server downtime. I have written a detailed description of the situation and how I worked around it on zfs-discuss here https://zfsonlinux.topicbox.com/groups/zfs-discuss/Ta4f2dccd6172681c/partial-pool-loss-on-ubuntu-22-upgrade and it may help others. I have not applied this patch.