I have a windows server 2012 R2 VM on vmware esxi 6.7. Have 2 virtual disks for C and D partitions respectively. Partition C - thin provision, part D - thick provision lazy zeroed. I extended second virtual disk by 100 GB. Then increased partition in OS by 100 GB. There was an error (don't remember what) and disk space hasn't changed. Rescanned disks, used diskpart, rebooted server - it doesn't help though.
Maybe somebody faced such an issue...
Disk management - screenshot. Strange picture...