I have a node running on Edo2net using tezos-client v8.2 with RPC port 8732.
When I try to run another node on different port (8733) and different data dir, it's ok.
But when I try to run a tezos-node 9.0~rc1, for Florencenet, on port 8733 and different data dir, it fails :
Another tezos node is probably running on one of these addresses (127.0.0.1:8733). Please choose another RPC port.
When I stop my Edo2net node (port 8732), I can start my Florencenet on 8733.
It seems v9.0~rc1 only cares about default port.
Is it a bug ?