Can't boot encrypted partition with Microsoft Keyboard

Hi,

I'm using
- a Lubuntu machine with an encrypted root partition with that special method of the Lubuntu installer, where there is no unencrypted boot partition, but grub itself decrypts the device

- due to some medical issues with the wrists because of spending too much time at the computer split/ergonomical keyboards, mostly Microsoft Natural Keyboards. No problem with older models.

But since replacing an older one with the

045e:082c Microsoft Corp. Microsoft Ergonomic Keyboard

I cannot boot, because with this keyboard I cannot enter the boot password. Grub seemed to ignore this, and I had to use a second (cheap, regular) keyboard just to enter the password.

This worked for some time with a second keyboard just for the boot password, but recently I have to unplug the microsoft keyboard in order to have the cheap one working.

On a different machine with Xubuntu (thus the common way to boot the kernel into an unencrypted boot partition and then pivot the root into the encrypted) and a keyboard of the same kind, there is no problem.

So grub is having a problem with this keyboard.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: grub-pc 2.06-2ubuntu7.1
ProcVersionSignature: Ubuntu 5.15.0-58.64-generic 5.15.74
Uname: Linux 5.15.0-58-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: LXQt
Date: Sun Jan 22 15:33:22 2023
InstallationDate: Installed on 2020-06-12 (953 days ago)
InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: grub2
UpgradeStatus: Upgraded to jammy on 2022-05-28 (238 days ago)