Not sure I understand your remark, the snapshot size displays what is in the delta file, not including the size of the VMDK.
In other words you would only see the changes made to the VMDK after the snapshot is taken.
Perhaps you could show us an example screenshot of what you mean?
Exactly, which used to be the size of the *-delta.vmdk file. But now it clearly is not for us. Not exactly certain when this changed for us, but it was sometime after Oct 25th of this year.
> Get-Snapshot * |select *
Description : Taken prior to upgrade
Created : 11/28/2017 10:00:00 PM
Quiesced : False
PowerState : PoweredOff
VM : Mango
SizeMB : 0.06697845458984375
SizeGB : 0.000065408647060394287109375
IsCurrent : True
IsReplaySupported : False
From where did you obtain that VMDK size?
From the datastore browser in the Web Client?
So that information is from a 'du' command executed from a linux host with the datastore mounted NFS.