Installing on 3 TB BTRFS raid1 with data and EFI of 133 MB already new FAT32 fails

[Iuga Marian Silviu]

I have 2 PCS 3TB HDD with some data on BTRFS raid1 with no subvolumes
sda 8:0 0 2.7T 0 disk
├─sda1 8:1 0 2.7T 0 part
└─sda2 8:2 0 126.9M 0 part /target/boot/efi
sdb 8:16 0 2.7T 0 disk
├─sdb1 8:17 0 2.7T 0 part /target/home
└─sdb2 8:18 0 63.7M 0 part
The installer is not smart enough (yet) to properly install Ubuntu this way.
Please try to fix the installer to work in this case.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.10
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
Date: Sat Mar 13 11:09:38 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)