Deleted node still visible in web/corosync.conf

I removed a node from a two node cluster. I first had to set quorum_votes: 2 inside /etc/pve/corosync.conf on the remaining node.
pvecm delnode pvec1n2 worked perfectly. The removed node is offline and not connected to the network.

However the deleted node is still visible as a red entry on the web GUI. I've followed:
https://forum.proxmox.com/threads/deleted-nodes-still-visible-in-ha.87521/...

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