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I just verified this is happening with the latest version of VirtualBox (6.1.16) and latest version of Guest Additions (6.1.16) even on my Linux Host (with Windows 10 guest VMs).
I never noticed it because I never have the 3D acceleration turned on in the VBoxSVGA video settings for my Windows guest VMs. VirtualBox 3D acceleration has always been flaky in the past, and is still listed as experimental during the Windows Guest Additions installation. I always disable it in the VM's display settings as a rule.
So if you need to use newer versions of Sigil in a Windows VirtualBox VM, then plan on disabling 3D acceleration in the VM's Display settings. It's not as if Sigil will really benefit from 3D acceleration anyway. *shrug*
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