That could depend on the NewDiskPolicy you have in the OS.
Can you check (from an elevated PS prompt) with
Get-StorageSetting | Select-Object NewDiskPolicy
If it doesn't say OnlineAll, then the behaviour you are seeing is normal.
You can change the policy with
Set-StorageSetting -NewDiskPolicy OnlineAll
The policy is set correctly. The disks I am working with are not new disks. These are disks already in use, I just need to move a few existing drives to the new controller. I have to do this numerous times with different servers.