Swiss keyboard layout, Caps Lock key no longer generates large ä after upgrade from 23.04 to 23.10

[Niklaus Ingold]

The ubuntu-release-upgrader correctly recognizes the swiss keyboard layout. But after installation of ubuntu 23.10, the caps lock key does not work as expected. It does not generate large ä, ö, ü, é, à, è in packages like libreoffice (7.6.2.1), thunderbird (115.32-2), firefox (119.0-2) and gnome text editor. The output is a small ä, ö, ü, à, é, è instead.
The problem does not exist in ubuntu 23.04.

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: ubuntu-release-upgrader-core 1:23.10.10
ProcVersionSignature: Ubuntu 6.5.0-10.10-generic 6.5.3
Uname: Linux 6.5.0-10-generic x86_64
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 30 10:16:15 2023
InstallationDate: Installed on 2023-10-24 (6 days ago)
InstallationMedia: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 (20231016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)