VHDX files & Enable file level recovery option (HYPER-V Policy Type)

Hi

Master & Media : RHEL6, 7.6.0.2
HYPER v : WIn 2012 R2, 7.6.0.2

Files format vhdx, as per netbackup documentation File level recovery is not possible with option "ENABLE FILE LEVEL RECOVERY".

However I am able to recover a single file from following environment.

Policy type: Hyper V
hyper V : win 2012 r2
Nbu : 7.6.0.2
ENable File Level recovery : yes
offline backups for non VSS VMs: yes

kindly suggest if I am missing something,  because as per symantec notes it should not work..