Bug#1021846: grub-install is broken since 2.06-3: error: unknown filesystem

[программист некто]

Package: grub-pc
Version: 2.06-3~deb11u1
Severity: critical

Hello. Since version 2.06-3, grub-install is broken: it fails with "error: unknown filesystem".
I test command /usr/sbin/grub-install -v /dev/sda
in some versions. Results in mail attachments.
Versions older than 2.06-3 works without error (2.06-2 and lower).
Tested versions: 2.04-20, 2.06-1, 2.06-2, 2.06-3~deb10u1, 2.06-3~deb11u1, 2.06-4.

Disk partitions:

# fdisk --list-details
Disk /dev/sda: 29,82 GiB, 32017047552 bytes, 62533296 sectors
Disk model: TS32GSSD370S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc7177f7e

Device Boot Start End Sectors Id Type Start-C/H/S End-C/H/S Attrs
/dev/sda1 2048 22763519 22761472 83 Linux 4/4/1 1023/254/2
/dev/sda2 * 25866240 62531583 36665344 7 HPFS/ 1023/254/2 1023/254/2 80

$ disktype /dev/sda1
--- /dev/sda1
Block device, size 10.85 GiB (11653873664 bytes)
F2FS file system (version 1.14)

$ disktype /dev/sda2
--- /dev/sda2
Block device, size 17.48 GiB (18772656128 bytes)
NTFS file system
Volume size 17.48 GiB (18772652032 bytes, 36665336 sectors)
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