Bug#984760: Error: symbol 'grub_is_lockdown' not found

[finity69x2]

I've run into the same issue on upgrading from Stretch to Buster.

After upgrade everything worked and even reboots went fine.

then I decided to upgrade from Buster to Bullseye.

When I did that I did an update and upgrade of packages to prepare for the
OS upgrade.

When I rebooted from that process I got the error above.

I'm completely stuck.

I'm at the grub rescue prompt and I have no idea how to proceed from here.

I've done searches everywhere I can think to look and there seems no
definitive way to recover from this.

What do I need to do to recover?
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