Converting Thick to Thin - Stays Thick! need help

Hello,

I have a few VM's that are using "Thick Provision Eager Zeroed" Virtual Disk's that don't need to be, and I am trying to convert them to Thin.

Here is what I have tried so far:

Try #1

Using vSphere client connected to vCenter bundled with vSphere Essentials Plus 5, Shutting down the VM in question -> Right-Click -> Migrate -> Change Datastore -> "Select a virtual disk format: Thin Provision -> Selected a different Datastore

Result: Only Hard Disk 1 gets converted to Thin!, Hard disk 2 stays "Thick Provision Eager Zeroed"

Try #2

Using vSphere client connected to vCenter bundled with vSphere Essentials Plus 5, Shutting down the VM in question -> Right-Click -> Migrate -> Change Datastore -> Advanced -> Selected a different Datastore for each Hard Disk -> Disk Format set to "Thin Provision" for each Hard Disk

Result: Hard disk 2 stays "Thick Provision Eager Zeroed"

Try #3

Removed VM from Inventory and Re-added

Result: Hard disk 2 stays "Thick Provision Eager Zeroed"

Try #4

Enabled SSH on the current ESXi Host in the Cluster ->

Putty to ESXi SSH Command Line -> cd /vmfs/volumes/OS* (Current location of the VMDK files)

-> vmkfstools -i HardDisk1.vmdk -d thin thinHardDisk1.vmdk

-> vmkfstools -E HardDisk1.vmdk thickHardDisk1.vmdk

-> vmkfstools -E thinHardDisk1.vmdk HardDisk1.vmdk

-> vmkfstools -U thickHardDisk1.vmdk

-> removed VM from Inventory and Readded

Result: Hard disk 2 stays "Thick Provision Eager Zeroed"

Note: also tried this using "mv" instead of "vmkfstools -E" with no change in the results

Any Ideas? I really didn't want to have to use the converter just to change the Disk format

Why did Hard Disk 1 get converted fine? It may have been "lazy zeroed" and not "eager zeroed" if that makes a difference.