Install on Debian 12 VM went smooth. Tested on XCP-ng 8.2.1 & using Xen Orchestra, commit 5fe53. When changing networks it updates the IP very fast, but does not clear the previous IP addresses from the other networks. I did confirm they are not showing in the VM.
Issue is still persistent and can be reproduced.
After a reboot the old IPs are not showing up again until you change the network again.
Tested on fully patched XCP-NG 8.2.1 and XenOrchestra from Sources on commit 84650.