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This is also one of those painful things lately. I also happened to try rancher long time ago (and removed it according to instructions). Well last two upgrades have shown that if you try rancher there is no going back.

Honestly, my issues wasn't related to that

It was probably some of those n issues I also faced.

removed the Harvester cluster from Rancher and it was all fine - root cause was the Longhorn pre-drained issue I mentioned below