New PVE 9 node shows "unknown"/offline in GUI from PVE 7/8 nodes, despite cluster status/quorum being OK

Hi all, I added a new node to my existing PVE cluster ( mixed versions — most nodes are 8.x, one is still 7.x, and the new node is 9.2.2). Context: the node name "pve8" was previously used by a different physical node, which I properly removed from the cluster via `pvecm delnode` some time ago. I ve now reused that name for a new node, installed fresh with PVE 9.2.2, with a new/different IP…