Manual partitioning, encrypted partition isn't mounted after creation

[Douglas Silva]

To reproduce:
1. Do manual partitioning, select target device (nvme0n1 here) and create a new partition table (UEFI, GPT)
2. Create the following partitions: 1GB EFI (/boot/efi), 1GB ext4 (/boot), remaining space to be encrypted for root (/).

The encrypted partition is formatted as expected (crypto type), but it is not automatically opened and mounted. Ubiquity is expected to mount (/dev/mapper/*) and expose that partition a few seconds after the "crypto" is created, but that doesn't ever happen. The installation cannot continue without it.

This only affects Kubuntu 22.04. I've installed Ubuntu and Xubuntu (22.04 or 22.10) like this without problems.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.15.0-56.62-generic 5.15.64
Uname: Linux 5.15.0-56-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Fri Dec 16 08:44:07 2022
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
InstallationDate: Installed on 2022-12-12 (4 days ago)
InstallationMedia: Kubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)