Restoring snapshot of Whonix 15/14 + Vbox 6.0.4 on debian buster will give this error:
VERR_SSM_LOADED_TOO_LITTLE
VirtulaBox upstream bug:
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Error 'lsilogicsas' (VERR_SSM_LOADED_TOO_LITTLE) when opening a saved session
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virtualbox.org • View topic - Problem restoring saved machine
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?