Debian Installer/preseed Partman Setup for RAID and LVM

preseed.cfg

# Force the system to unmount any previously found file systems
d-i     preseed/early_command string umount /media || true
# We are using RAID as our method - This is important
d-i     partman-auto/method string raid
# Define which disks we want to use in our RAID configuration
d-i     partman-auto/disk string /dev/sda /dev/sdb
# Remove any previous LVM metadata
d-i     partman-lvm/device_remove_lvm boolean true
# Remove any previous MD metadata
d-i     partman-md/device_remove_md boolean true
# Confirm, because we are doing an automated install...
d-i     partman-lvm/confirm boolean true
# Tell the installer we want to use the definition defined below "custompartitioning"
d-i     partman-auto/choose_recipe select custompartitioning
# Specify the name of the Volume Group. Not required, but helps be consistent
d-i     partman-auto-lvm/new_vg_name string VGroup
# This will cause LVM to use the maximum size for whatever is left over when creating an LV (I think)
d-i     partman-auto-lvm/guided_size string max
# Defining our custom partition
# First partition is for UEFI boot
# Second partition is setup to be RAID raidid=1
# Third partition is setup to be the rest of the disk also RAID raidid=2
# Fourth definition is setup to be an LVM LV for /home at 10GB
# Fifth definition is setup to be an LVM LV for swap at 8GB
# Sixth definition is setup to be an LVM LV for / (root) for the remainder of the drive 
d-i     partman-auto/expert_recipe string       \
	custompartitioning ::                   \
             1 1 1 free                         \
                    $gptonly{ }                 \
                    $primary{ }                 \
                    $lvmignore{ }               \
                    $bios_boot{ }               \
                    method{ biosgrub }          \
            .                                   \
            1024 2 1024 raid                    \
                    $primary{ }                 \
                    $lvmignore{ }               \
                    method{ raid }              \
                    raidid{ 1 }                 \
            .                                   \
            20480 3 -1 raid                     \
                    $lvmignore{ }               \
                    method{ raid }              \
                    raidid{ 2 }                 \
            .                                   \
            10240 400 10240 ext4                \
                    $defaultignore{ }           \
                    $lvmok{ }                   \
                    lv_name{ home }             \
                    method{ format }            \
                    format{ }                   \
                    use_filesystem{ }           \
                    filesystem{ ext4 }          \
                    mountpoint{ /home }         \
            .                                   \
            8192 500 8192 linux-swap            \
                    $defaultignore{ }           \
                    $lvmok{ }                   \
                    lv_name{ swap }             \
                    method{ swap }              \
                    format{ }                   \
            .                                   \
            20480 600 -1 ext4                   \
                    $defaultignore{ }		\
                    $lvmok{ }                   \
                    lv_name{ root }             \
                    method{ format }            \
                    format{ }                   \
                    use_filesystem{ }           \
                    filesystem{ ext4 }          \
                    mountpoint{ / }             \
            .

# Here we tell the RAID how we want the drives used 
# First one: (RAID1, 2 devices, 0 spares, formated as ext3, mounted to /boot)
# Second one: (RAID1, 2 devices, 0 spares, setup as LVM, no mount)
d-i partman-auto-raid/recipe string  \
    1 2 0 ext3 /boot                 \
          raidid=1                   \
    .                                \
    1 2 0 lvm -                      \
          raidid=2                   \
    .

# Don't allow the RAID to be created in degraded mode
d-i mdadm/boot_degraded boolean false
# Again, confirming things because we are automating this
d-i partman-md/confirm boolean true
# More confirming... seriously.
d-i partman-partitioning/confirm_write_new_label boolean true
# Yep, more confirming... I mean, come on.
d-i partman/choose_partition select Finish partitioning and write changes to disk
# .... ugh
d-i partman/confirm boolean true
# REALLY?!?
d-i partman-md/confirm_nooverwrite  boolean true
# You have got to be kidding!
d-i partman/confirm_nooverwrite boolean true

Can't get this to work on Debian 11 even with copypasted preseed:
mdadm: cannot open raidid=1: No such file or directory

Are you sure you want ext3 instead of ext4?