linux-edge does not generate an initramfs when zstd is not installed

with zstd installed:

(1/1) Installing linux-edge (6.1.8-r0)
Executing busybox-1.35.0-r29.trigger
Executing kmod-30-r1.trigger
Executing mkinitfs-3.7.0-r0.trigger
==> initramfs: creating /boot/initramfs-edge
Executing grub-2.06-r6.trigger
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-edge
Found initrd image: /boot/initramfs-edge
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done
OK: 9855 MiB in 1509 packages

without:

(1/1) Installing linux-edge (6.1.8-r0)
Executing busybox-1.35.0-r29.trigger
Executing kmod-30-r1.trigger
Executing mkinitfs-3.7.0-r0.trigger
==> initramfs: creating /boot/initramfs-edge
Command "zstd" is not available.
Executing grub-2.06-r6.trigger
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-edge
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done
OK: 9854 MiB in 1508 packages

notably no Found initrd image: /boot/initramfs-edge line