VritualBox Whonix restoring snapshot - Error 'lsilogicsas' VERR_SSM_LOADED_TOO_LITTLE

Restoring snapshot of Whonix 15/14 + Vbox 6.0.4 on debian buster will give this error:



VirtulaBox upstream bug:

Workaround: shut down VMs before taking snapshots.

Non-solutions: switching virtual hard disk controller to SATA AHCI due to:

Maybe some other vrtual hard disk controller would be affected by neither snapshot restore not ata freeze bug?