default kernel left installed on systems which use oem kernel

I've installed (with network during the installation) on the "oem-qemu-meta" platform. The oem kernel was indeed installed and booted from, but the default HWE kernel has been left installed.

laney@focal-ubuntu-oem-meta:~$ dpkg -l | grep linux
ii console-setup-linux 1.194ubuntu3 all Linux specific part of console-setup
ii libnvpair1linux 0.8.3-1ubuntu12 amd64 Solaris name-value library for Linux
ii libselinux1:amd64 3.0-1build2 amd64 SELinux runtime shared libraries
ii libuutil1linux 0.8.3-1ubuntu12 amd64 Solaris userland utility library for Linux
ii libv4l-0:amd64 1.18.0-2build1 amd64 Collection of video4linux support libraries
ii libv4lconvert0:amd64 1.18.0-2build1 amd64 Video4linux frame format conversion library
ii libzfs2linux 0.8.3-1ubuntu12 amd64 OpenZFS filesystem library for Linux
ii libzpool2linux 0.8.3-1ubuntu12 amd64 OpenZFS pool library for Linux
ii linux-base 4.5ubuntu3 all Linux image base package
ii linux-firmware 1.187 all Firmware for Linux kernel drivers
ii linux-generic-hwe-20.04 5.4.0.24.29 amd64 Complete Generic Linux kernel and headers
ii linux-headers-5.4.0-24 5.4.0-24.28 all Header files related to Linux kernel version 5.4.0
ii linux-headers-5.4.0-24-generic 5.4.0-24.28 amd64 Linux kernel headers for version 5.4.0 on 64 bit x86 SMP
ii linux-headers-5.6.0-1007-oem 5.6.0-1007.7 amd64 Linux kernel headers for version 5.6.0 on 64 bit x86 SMP
ii linux-headers-generic-hwe-20.04 5.4.0.24.29 amd64 Generic Linux kernel headers
ii linux-headers-oem-20.04 5.6.0.1007.7 amd64 OEM Linux kernel headers
ii linux-image-5.4.0-24-generic 5.4.0-24.28 amd64 Signed kernel image generic
ii linux-image-5.6.0-1007-oem 5.6.0-1007.7 amd64 Signed kernel image oem
ii linux-image-generic-hwe-20.04 5.4.0.24.29 amd64 Generic Linux kernel image
ii linux-image-oem-20.04 5.6.0.1007.7 amd64 OEM Linux kernel image
ii linux-modules-5.4.0-24-generic 5.4.0-24.28 amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii linux-modules-5.6.0-1007-oem 5.6.0-1007.7 amd64 Linux kernel extra modules for version 5.6.0 on 64 bit x86 SMP
ii linux-modules-extra-5.4.0-24-generic 5.4.0-24.28 amd64 Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
ii linux-oem-20.04 5.6.0.1007.7 amd64 Complete OEM Linux kernel and headers
ii linux-oem-5.6-headers-5.6.0-1007 5.6.0-1007.7 all Header files related to Linux kernel version 5.6.0
ii linux-sound-base 1.0.25+dfsg-0ubuntu5 all base package for ALSA and OSS sound systems
ii pptp-linux 1.10.0-1build1 amd64 Point-to-Point Tunneling Protocol (PPTP) Client
ii syslinux 3:6.04~git20190206.bf6db5b4+dfsg1-2 amd64 collection of bootloaders (DOS FAT and NTFS bootloader)
ii syslinux-common 3:6.04~git20190206.bf6db5b4+dfsg1-2 all collection of bootloaders (common)
ii syslinux-legacy 2:3.63+dfsg-2ubuntu9 amd64 Bootloader for Linux/i386 using MS-DOS floppies
ii util-linux 2.34-0.1ubuntu9 amd64 miscellaneous system utilities
ii zfsutils-linux 0.8.3-1ubuntu12 amd64 command-line tools to manage OpenZFS filesystems

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.13
ProcVersionSignature: Ubuntu 5.6.0-1007.7-oem 5.6.2
Uname: Linux 5.6.0-1007-oem x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 17 11:42:13 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
InstallationDate: Installed on 2020-04-17 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200417)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)