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Is the new node a completely brand-new node? Or is it the node that you removed and then re-installed Harvester and tried to rejoin

That is the node I removed then re-install, but it never appear in the cluster page. is that because the upgrade status not completed yet, so the cluster not allowing new node to join?

Was this screenshot from before or after you removed the node? We do sometimes see issues when reinstalling Harvester on a node without wiping the partitions on the disk. I wonder if it's possible that after reinstalling it's trying to join the cluster with its previous identity. Would you be willing to collect a support bundle and either upload it to a GitHub issue or send it to this email address so we can take a look: harvester-support-bundle@suse.com