Downgraded to 2.02 and everything works again.

Major difference in debug output on 2.02 is the line which says:

2.02:

shim bla bla not available
shim_lock bla bla
linuxefi_secure_validate: 0

2.04:

SecureBoot: 0
SetupMode: 1
secure boot not enabled, not validating bla bla linuxefi_secure_validate: 1

If you didn't notice the difference - 2.02 detects that Secure Boot is
disabled and sets:

linuxefi_secure_validate: 0

2.04 also detects that Secure Boot is disabled, however sets:

linuxefi_secure_validate: 1.

This issue looks almost exactly the same as:

https://github.com/aarch64-laptops/build/issues/18
and as Bug 1839317

Please confirm and link with 1839317.

** Bug watch added: github.com/aarch64-laptops/build/issues #18
   https://github.com/aarch64-laptops/build/issues/18

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https://bugs.launchpad.net/bugs/1845289

Title:
  Grub EFI amd64 no longer start EFI/Microsoft/Boot/bootmgfw.efi

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