Press "Cancel" button during initial "waiting on 16 modules to load" causes Calamares to hang

ISO testing 20.04 Lubuntu daily image (20200317). If I click the "Cancel" button while Calamares is starting up, displaying the "waiting on n modules to load... 4 seconds," it hangs.

Even right-clicking the Calamares placeholder in the taskbar, and "close" doesn't entirely get rid of it. The Calamares window disappears. But, the "Lubuntu inst... [Killing]" placeholder remains in the taskbar.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: calamares 3.2.20-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
.etc.calamares.modules.finished.conf:
 ---
 restartNowMode: user-checked
 restartNowCommand: "systemctl -i reboot"
.etc.calamares.modules.partition.conf:
 efiSystemPartition: "/boot/efi"
 enableLuksAutomatedPartitioning: true
 userSwapChoices: none
 drawNestedPartitions: true
 defaultFileSystemType: "ext4"
.etc.calamares.modules.shellprocess_logs.conf:
 ---
 dontChroot: true
 timeout: 30
 script:
     - calamares-logs-helper @@ROOT@@
.etc.calamares.modules.unpackfs.conf:
 ---
 unpack:
     - source: "/cdrom/casper/filesystem.squashfs"
         sourcefs: "squashfs"
         destination: ""
ApportVersion: 2.20.11-0ubuntu20
Architecture: amd64
CasperVersion: 1.441
CurrentDesktop: LXQt
Date: Tue Mar 17 19:31:14 2020
LiveMediaBuild: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200317)
RelatedPackageVersions:
 calamares-settings-ubuntu-common 1:20.04.2
 calamares-settings-lubuntu 1:20.04.2
 xfsprogs 5.3.0-1ubuntu1
 btrfs-progs 5.4.1-2
SourcePackage: calamares
UpgradeStatus: No upgrade log present (probably fresh install)