Ubiquity crashes (ZFS+encryption;automatic scheme)

[Nicolas]

Using 20.10's freshest iso (2020-10-13.1).

Did a `apt update && apt upgrade` before running ubiquity.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubiquity 20.10.11 [modified: usr/share/ubiquity/zsys-setup]
ProcVersionSignature: Ubuntu 5.8.0-22.23-generic 5.8.14
Uname: Linux 5.8.0-22-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.452
Date: Wed Oct 14 22:48:55 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Beta amd64 (20201013.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
 LC_NUMERIC=C.UTF-8
RebootRequiredPkgs:
 linux-image-5.8.0-23-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Nicolas (girard-nicolas)]

I chose not to upload the logfile containing the passwords ; but I'm willing to perform another run with dummy passwords, then attach the relevant logfile if it helps.

[Nicolas (girard-nicolas)]

The problem remains today after another `apt update && apt upgrade`.

Is there anything I can do to make any progress in this situation ?