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Looks like that needs some triaging from the core team, it may turn out to be a UI issue though. Might be worth bringing up in the next Engineering Office hours (see https://github.com/rancher/rancher/labels/rancher-office-hours for upcoming ones)

Most definitly a ui issue. If you

edit the cluster as yaml

in the ui, the empty values can be removed and saved correctly. After that the yaml is not parsed before saving it to disk. So its only the serialization from the ui to the yaml that would be saved. I will check the office hours. Thank you

I've moved it over to the UI's repo (rancher/dashboard). I can't reproduce this with an RKE2 cluster without an encryption provider so updated the title appropriately