azerty keyboard layout unavailable at boot for luks password prompt

Hi,
Using focal 20.04 live server ISO with subiquity (with auto upgrade active ) to install a server with french locale, french azerty keyboard layout and using encryption (luks) with lvm to format the disk result in a functional installation but at the luks password prompt on boot to unlock the disk, keyboard layout is always 'qwerty" and not 'azerty'

Same result in a virtual machine (BIOS or UEFI mode on VMware workstation 14.x) or with laptop DELL Latitude 74xx (BIOS or UEFI mode) with network boot (using iPXE to load focal live server iso)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: subiquity (1966)
ProcVersionSignature: Ubuntu 5.4.0-45.49-generic 5.4.55
Uname: Linux 5.4.0-45-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB:
 {
        "impl": "launchpad",
        "project": "subiquity",
        "bug_pattern_url": "http://people.canonical.com/~ubuntu-archive/bugpatterns/bugpatterns.xml"
     }
CurtinLog: Error: [Errno 13] Permission denied: '/var/log/installer/curtin-install.log'
Date: Wed Sep 2 21:13:45 2020
InstallationDate: Installed on 2020-09-02 (0 days ago)
InstallationMedia: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release amd64 (20200623)
InstallerLog: Error: [Errno 2] No such file or directory: 'logfile'
ProcEnviron:
 SHELL=/bin/bash
 LANG=C.UTF-8
 TERM=linux
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
SourcePackage: subiquity
Symptom: installer
UpgradeStatus: No upgrade log present (probably fresh install)