Root partition seems not to be trimmed

[jd-debian-user@dybdal.dk]

I have a Trixie system with two nvme disks, with a total of three 
partitions.

Once a week Trixie does an fstrim.  But it seems that one of the 
partitions (the root file system partition) is not trimmed.  I see this 
in the log:

2025-11-17T00:56:12.619791+01:00 andy systemd[1]: Starting 
fstrim.service - Discard unused blocks on filesystems from /etc/fstab...
2025-11-17T00:56:29.351018+01:00 andy fstrim[5599]: /disk2: 1.7 TiB 
(1831610261504 bytes) trimmed on /dev/nvme1n1p1
2025-11-17T00:56:29.351180+01:00 andy fstrim[5599]: /boot/efi: 1017.7 
MiB (1067110400 bytes) trimmed on /dev/nvme0n1p1
2025-11-17T00:56:29.352097+01:00 andy systemd[1]: fstrim.service: 
Deactivated successfully.
2025-11-17T00:56:29.352236+01:00 andy systemd[1]: Finished 
fstrim.service - Discard unused blocks on filesystems from /etc/fstab.

But why does it seem not to trim the root partition (/dev/nvme0n1p2)?  
The EFI partition on the same physical disk seems to be trimmed fine.

The fstrim command Trixie uses is:

# systemctl cat fstrim | grep ExecStart
ExecStart=/sbin/fstrim --listed-in /etc/fstab:/proc/self/mountinfo 
--verbose --quiet-unsupported

My fstab contains

LABEL=ESPANDY    /boot/efi       vfat    nofail,errors=remount-ro 0 2
LABEl=root       /               ext4    errors=remount-ro 0 1
LABEL=disk2      /disk2          ext4    errors=remount-ro 0 1

Thanks,

Jesper