This is known behaviour in the VCDA, it is not having an impact on the operation of the migration VM. Please follow this KB for future updates.
Workaround
To include those specific characters (Cloud Director suffix) in the migrated VM name, we could rename the VM in Cloud Director by adding a single character, then rename it again to remove that character.
This rename operation will resolved in Cloud Director adding a new suffix to the VM name in the vSphere.