Why don't you try to do a storage migration, there you would get the option to convert it. Try this way and check. BY the way the command that you are giving would keep the disk.vmdk as it is and should create a new disk named thin-disk.vmdk, which should be thin disk. So what is the size and type of thin-disk.vmdk? Please confirm. Also if the thin-disk.vmdk is not in thin format then can you try to clone into any other datastore? Just for checking purpose.
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