It sounds like you tried to switch the pool master to a host at a lower xapi level. Had the host that you designated as the new pool master already been patched?
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Posts
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RE: botched pool patching and now we can't change pool master
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RE: SR stats show “No stats” in Xen Orchestra after latest XCP-ng 8.3 patches
Hmm it doesn't ring a bell to me. I would suggest to open a ticket in parallel so someone could take a look on next week

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RE: SR stats show “No stats” in Xen Orchestra after latest XCP-ng 8.3 patches
Hi,
Are you using QCOW2?
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RE: "NOT_SUPPORTED_DURING_UPGRADE()" error after yesterday's update
Exactly and that's what does the Rolling Pool Update feature
