grub forgets to ask for passphrase of encrypted zfs partition

[geole0]

Good morning
I have just painfully installed ubuntu in an experimentally encrypted ZFS disk. see this discussion:
https://bugs.launchpad.net/subiquity/+bug/2061302

But the installation crashes at startup in busybox with the message
cryptsetup: warning: dm_crypt-0 couldn't determine devicetype. assuming defaul
t (plain)
 cryptsetup: warning: Option 'cipher' missing in crypttab for plain dm-cryp mapp
ing dm_cript-0. Please read /user/share/docs/cryptsetup-initramfs/README.intiramfs
.gz and add the correct 'cipher' option to your crypttab(5).
cryptsetup: warning: Option 'size' mssing in crypttab for plain dm-cryp mappin
q dm_cript-0. Please read /user/share/docs/cryptsetup-initramfs/README.intiramfs.g
z and add the correct 'size option to your crypttab(5).

Command: /sbin/zpool import -c /etc/zfs/zpool.cache -N 'rpoll
Message; cannot import 'rpool':: pool was previously in use from another system.
Last acceded by ubuntu (hostid=38138694) at Wed 1 13:52:31 2024
The pool can be imported, use 'zpool import -f' to import the pool.
cachefile imprt failed.rerying
Error: 1

Failed to import poot 'rpool' and exit

Busybox v1.36.1 (ubuntu 1:1.36.1-6ubuntu3) builtin shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

So i do
zpool import bpool -f
zpool import rpool -f
no error are detected

Then I decide to reboot. My secret phrase is then requested The boot then goes perfectly well

I would like to point out that during installation, the software asked me to "continue testing" and that I answered yes.
I had only looked at the contents of the EFI partition.

I am now logged in and a software problem has occurred....