can't install Ubuntu 22.04 using BTRFS RAID1

[David F]

Installer fails when I attempt to install Ubuntu on BTRFS using RAID1. Formatted disks outside of ubiquity, setup RAID1 through mkfs.btrfs, choose something else choose to mount btrfs partition as / without format.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubiquity 22.04.15
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.470
Date: Sat Sep 24 19:18:26 2022
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)