Describe the bug
I want to add a new SSD disk naa.xxx to existing disk group of type all flash.
So I used vsan API methods.InitializeDiskMappings(ctx, roundTripper, req). But the task got failed, and shown me the error: 'A general system error occurred: Disk naa.xxx is an SSD and can not be used as a vSAN HDD.'

To Reproduce
Steps to reproduce the behavior:

1. declare a request body
   req = &types.InitializeDiskMappings {
   This: ...,
   Spec: types.VimVsanHostDiskMappingCreationSpec {
   Host: host.Reference(),
   CacheDisks: []vim25types.HostScsiDisk{ ... },
   CapacityDisks: ...,
   CreationType: string(types.VimClusterVsanDiskGroupCreationTypeallflash)
   },
   }
2. invoke the method to append disk
   res, err = methods.InitializeDiskGroups(ctx, roundTripper, req)
   ...
3. wait for task completion
   Get response with error like above said: A general system error occurred: Disk naa.xxx is an SSD and can not be used as a vSAN HDD.

Expected behavior
The addition will be successful.

Affected version
v0.26.1

Screenshots/Debug Output
N/A

Additional context
VMware vCenter Server Appliance7.0.3-19600472
VMware ESXi7.0.3-19580434