Hello
All vendors have this issue, it's not an issue with the vendor, it's to do with how the SCSI protocol works.
The Initiator, needs to relog to discover the new paths. What you can try and do if you have multipathing properly configured is to offline a single port from the switch, online it again, and then see if it will find the new luns from the new device. Once the new device is discovered you should find that a normal rescan will pickup any new luns on the discovered device.