When deploying a VM from a template, it does not change Hard Disk UUID

[Alex_G1]

Hi all. There is a problem.
I made a virtual machine template.
If I expand the VM from the template without "Customize this virtual machine's hardware", then UUID Hard Disk changes to a new one, if I use "Customize this virtual machine's hardware", I add CPU/RAM , then UUID of the Hard Disk does not change.

vCenter 7.0.3 19234570