The VMware snapshot feature will no longer instruct VMware to create a app-consistent snapshot before the ZFS snapshot was taken, which I believe was the exact purpose of this feature.
Specifically, in source code (https://github.com/freenas/freenas/blob/master/gui/tools/autosnap.py ) line 452-456
VimTask.WaitForTask(vm.CreateSnapshot_Task( name=vmsnapname, description=vmsnapdescription, memory=False, quiesce=False, ))
both have been set to false.
See fourm https://www.ixsystems.com/community/threads/vmware-coordinated-snapshot-not-working-properly.76528/#post-533091 post for more detailes.