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Here's the solution that worked for me:
https://forums.kali.org/showthread.php?48822-Kali-2020-2-OVA-VIRTUALBOX-HASH-SUM-MISMATCH&p=96304#post96304

Holy ****, this worked! What, exactly, does this do? And are there other security implications to consider?

I, too, am having the same issue. I've search the web for resolutions and have tried every one.